I am still trying to figure out mine, so someone else kick it off!!

Whichever app will recover my lost iPod Touch. Lost it a week ago.

This might already be a thread...



I use these multiple times everyday:

Facebook
Echofon (Twitter)
TouchMouse
Scrabble
Chess With Friends
Weather Channel
Google

I use these an average of once a day:

WikiTap
YellowPages
Photobucket
Pandora
Amazon.com
WootWatch

Apps that come in handy in a pinch:

PhoneFlix (Netflix queue)
Showtimes (apparently Flixter is better)
MLB AtBat
Craigsphone
Scribble Lite (like MS Paint)
CheckWord (primitive Scrabble dictionary)

Games I still play after the novelty wore off:

Word Pops
Sudoku
Morocco (Othello)

If I do not include social apps like Facebook, Tweetie and Foursquare it would currently be...

Evernote
FlightTrack Pro
ESPN ScoreCenter
Local Picks (Trip Advisor)
Yelp (a social app but provides info)
Weather Channel (make it six)

Boring but these are my most used and helpful.
On the music side:
Wolfgang's Vault
Public Radio
ooTunes
WunderRadio
Flycast
Pandora

Who is Hot (Weather Underground) - Really cool app that links your contact list with corresponding weather report
3D Sun (Space Weather) - Cool space stuff
Planets - Star map etc...
AA - American Airlines
Flightaware - Tracks flights real-time and shows flight delays
Shazam - So I know what I'm listening to
Maps - So I know where I am and where I'm going
AWCasino - Texas hold, Craps etc...
EuchreLite - Cards

All the above apps are free.
I can't seem to pull the trigger
and actually buy anything.

vLingo - a solid, free voice recognition app
Sonos - a remote control for in-house wireless music player

Those are the only two i use with any frequency that haven't already been mentioned. Favorite free games:

Papertoss - throwing paper into a wastebasket against varying wind currents and annoyed cubicle neighbors
Redball - dunno how to describe it. dumb little game but i love it.

tower madness and scramble are the games i play regularly

Facebook
Guitar Toolkit
Scrabble
Weatherbug
and a tie between The Tribune's app and ESPN ScoreCenter

Guitar Toolkit
Huffington Post
Voice Recorder
MLB At Bat
NY Times Reader

My favorite apps depend on how I'm rolling that night. For a casual evening, I like:

potato skins
stuffed mushrooms
onion rings
clams casino

When dining in style, it's:

teriyaki bites
dungeness crab
shrimp cocktail

Pandora
Sit or Squat
iFarted
NLogFree
Glow Hockey

The iPhone becomes worlds better with Instapaper. Get it.

I've found Reeder to be the best RSS app by a long shot.

Worthy games:
Canabalt
Tomena Sanner
Plants Vs Zombies
Peggle
Drop 7

This isn't for iphone/smartphone, but I thought this was too cool not to mention here.

Appalachian Trail
Appaloosa
Appointments with Destiny
Appearances deceive
Applesauce.

A new, premium sex app for iPhone, iPad and iPod Touch may seem like just another attempt to monetize sexual curiosity, but beneath the blunt title lies plenty of scientific backing. "SexyTime Sex Position Guide and Choreographer," by Arlington, Virginia based Calvert Strategies, has been on the market one month and has already been banned in China, even after overcoming complicated negotiations with Apple Inc. Apparently, not everyone fully appreciates the science of sex.
The company's mission is simple, yet ambitious: to improve health and wellness through better sex. "Easier said than done," says R. C. Kuhn, Calvert Strategies president and project "Chief Mad Scientist." "Few adult-themed products improve overall health because consumers are enticed primarily by flashy marketing, not quality. Most products reinforce behaviors in isolation of partners, or worse, are just scams, even in iTunes. Ironically, the people that most need sex coaching are least likely to seek help." But thanks to low-cost apps on phones worldwide, there's now a powerful platform for scientists to lend sound, healthy advice to virtually anyone, anywhere. "We're hoping we've designed something enticing, but also educational," adds Kuhn. "The brain is the most important sex organ. We want people enjoying exciting, rewarding lovemaking, and simultaneously becoming smarter about sex. Better, more frequent sex means healthier minds and bodies."
The SexyTime Choreographer is actually four high quality apps in one, offering more features than are available in several leading iPhone sex apps combined. It uses 3D figures to illustrate sexual positions like in the Kama Sutra, adding practical advice on improving execution. Users can even "Sext" positions to partners. But the designers really excelled at creating the interactive "Randomizer" and "Choreographer" utilities, which are easy to use, but powerful in execution. As described on www.SexyTimeApp.com, these features allow couples to generate randomized playlists of sexual positions, calling audibles in (selected) sexy voices to instruct couples when and how to switch positions. There's several innovative quick-launch features like the "Hit List" and "Run the Gauntlet" for beginners or more energetic lovers. For choosy partners, the Choreographer is a user-specified, sexual playlist generator, also providing bedside sex coaching. The app also offers sex advice gleaned from diverse scientific literature and best practices from happy couples. "Science offers great practical value to sex," suggests Kuhn. All this and it's only Version 1.
Despite markets inundated with adult content, these entrepreneurs educated in a variety of scientific disciplines strive to "bring science to the bedroom" to overcome the natural awkwardness of suggesting new ideas and techniques to partners. But the well-intentioned proof of concept still met enormous challenges from Apple's review team, precisely while Apple publicly shunned sex apps. And though still banned in China, Calvert Strategies hopes science will eventually overcome. SexyTime sold in 26 countries within four weeks, garnering rave reviews from Thrillist.com, and an "Editor's Choice" review from AppCraver.com.
With significant upgrades on the way, Calvert Strategies is silent on new developments promising unique, innovative features to help lovers, but haven't lost sight of their original goal – educating and improving quality of life. "When done safely, sex is one of the healthiest and accessible human activities, though the subject remains unfortunately taboo," Kuhn concludes. "We're looking forward to offering products for more lifestyles, in addition to iPad/HD, Droid and multilingual versions. Apps are inexpensive compared to their enormous benefits. Imagine a world full of well sexed, healthier, happier humans. We should all want to live in that world."

tower madness is my favorite game
i use wikipanion often
food network
fandango
phoneflix

i have like 5 pages of apps but these are the only ones i use other than espn and iswim

I second Instapaper. The paid version is worth the money, although the free version is no slouch. THINGS is my favorite to-do list. Really helps organize myself. Expensive - $9.95 - but not wasted money.