It’s been 2 weeks now with my iPad and here are the apps that I use the most:
Reeder – allows me to sync Google Reader and do offline reading
Good Reader – PDF application with option to retrieve from WWW and FTP, great for reading product documentation
Twitter clients:
TweetDeck (when it doesnt crash…) and Twitterific
Games:
Osmos HD – relax game but complicated, you have to try it
Harbor Master – you move small boats in ports