List Your Favorite iPad Apps Here:

Questions on iPad education use? See: iPad4edu
Site with lesson plans using iPad apps: Apptivities
Another site: AppsForEdu

Education

3D Brain
Star Walk
Google Earth
The Elements
Solar Walk
Distant Suns 3
Planets
Redshift
Sky Safari
Soho
SpaceMap
Starmap HD
3D Sun
3DSunMoonHD
Exoplanet

Social Networking

Twitterrific
Gowalla
Foursquare
Meebo
FlickStackr - better Flickr search

Utilities

wKiosk
My Kiosk
Jump
The Calculator
Data Analysis
Calculator lab
GraphCalc HD
Dropbox

ServerAdmin

Reference
Dictionary
Wolfram Alfa
Wikipanion

Productivity

GoodReader (liking this more and more)
PlainText (simple text editing with DropBox integration, Hog's Bay Software)
SpeedText (best handwriting note taker I've tried)
iThoughtsHD (mindmapping)
WhiteboardHD
Perfect Browser (much, much better than Safari. Tabbed browsing, VGA support)
Expedition - browser with VGA out
iSaveWeb Pro HD - offline browsing
DropBox
FileMaker Go
Pages
Keynote
Gallery
Evernote

Sundry Notes Pro - super notes with Dropbox integration, etc
Adobe Ideas
Idea Sketch
AirSketch
SoundNote
Penultimate

PaperDesk - cf. Penultimate, hand drawn note taker
iAnnotate PDF
Citrix
Instapaper - save web pages for later reading
Flipboard - kind of like a bookmark for favorite websites and social networking

Games

Plants Vs. Zombies
Paper Toss
Doodle Jump
Labyrinth
Little Things

Music

Magic Piano
BeatBox Ultra

Entertainment

ABC Player
Netflix
Pandora
Flixter
Hulu Plus

News

The Weather Channel
Mashable
USA Today
AP

Art
Jot! Free
Qvik Sketch
Brushes
ArtStudio Pro
SketchBook
Glow It Free
ArtStudio
Idea Sketch
Strip Designer - cf. Comic Life on the Mac
Puppet Pals - create puppet shows with voice overs
SonicPics - add voice overs to slide shows

Misc.

JabberPad
TeacherPal (potential but not there yet)
eClicker
Compass
eBay
TWITPad
AirVideo
Grocery IQ

Language (Chinese)
Pleco
Chinese Flashcards
ILoveChinese
My Chinese Coach
ChineseWrtr
Feed Me!
SPK Chinese

For Principals

eCove - Teacher and student observation note taking