Still a newbie to the iPad, but my fav apps so far:
My top apps
Star Walk - simply awesome if you're into astronomy or simply want to showoff - take a pic of the sky and get info on the stars!
GarageBand - probably too good an app for me (if you're into creating music)
iChessPack HD - goodlooking interface with fics, icc chess servers (now if I can only get it to work :erm: )
Invisibility - to show off to friends
My 2yr old son's fav apps
Talking Tom 2 (nuff said)