Web 2.0 App Search Engines
Go2Web20'
All My Faves

Slideshows
You S__k at Power Point
Slideshare.net--search for pre-made slideshows
Presentation Zen--the master of presenting, Garr Reynolds
Slide--add amazing flash transitions to your slides
SlideOO--create a horizontal slide show
Animoto--upload your slides, choose your music, and Animoto mixes it!
Picturetrail--add fancy transitions and cool shapes to your slides

Avatars
Build Your Wild Self--turn yourself into a cute little elf
DoppelMe
Face Your Manga
Frenzoo--3D avatars
Stardoll
Voki--animated avatars with your voice

Creating Art
Doink--create animations
Draw.to--draw something and share it
Gogofrog--3D drawing
Myoats--super cool graphic drawing

Google
Demo Slam--really well worth checking out to see how to integrate Google tools
Google Docs--create a document, presentation, spreadsheet, form, or drawing
Google Calendar

Online Magazines
OpenZine
Issuu
MagCloud

Making Magazine Covers
Fake Magazine Cover
MagMyPic

Editing Photography
Aviary
Picassa
Picnik
pixlr

Photography Fun
Big Huge Labs
Fun Photo Box
Photo505
PhotoFaceFun
PicJoke.net
Pizap

Word Clouds
Tagxedo--really neat forms to choose from
Wordle

Tons of Kid Apps All in One
ABC Ya!
Kaboose
Magic Widgets
PrimaryGames
Starfall