NYT editor's pick: This is a glimpse on what digital media should be. Excellent presentation.
Goodreader: PDF and other documents, blazing fast
ComicZeal: Have CBRs? Get this (or cloudreader, I think comiczeal is more polished but you can't beat cloudreader's price)
StarWalk if you're into stars or like the eye candy
gmail is better on the browser than in the mail app
evernote for ipad
I have a few more, but IMHO these are all well worth the time of a fellow gdgt
NB: AppAdvice is also worth the $2 if you want to stay abreast of news and upcoming apps, including those that are on sale (just today, app x is free)