Take notes at seminars (this is a very frequent thing for me)
Teaching (I teach a class on Saturday mornings)
Mobile database (Bento)
Note synching on the go (SimpleNote - but also use it on iPhone 4)
Serious web browsing - use it to get around web surfing controls

Light document creation (always put finishing touches on it using Mac)
Book reading (mainly Kindle, since the iBookstore sucks)
Remote controlling Snow Leopard Servers using VNC Viewer
Organizing Netflix queue
Weather - I live in tornado alley and use it extensively when satellite feeds are out.
I'm a serious football fan, and I use my iPad to keep up with games while I'm watching others during football season.
Dropbox for accessing documentation of all types.
Read It Later - self explanatory.
RSS News using NewsRack, and other news such as NY Times, BBC, Business Insider and Twitter (I use Twitter for news often).
Facebook using Social and Safari
Light photo editing
Remote control when MacBook Pro is hooked up to TV and I don't want my iPhone occupied/am not happy with functionality of Apple Remote for that application
Sometimes I let my three-year old son watch a movie on it, but he has his own iPhone 3G (not activated, of course) for that.
