Most of these will be iPad apps.
I am way deep into N.O.V.A. HD right now. Before that was Zombie Attack 2nd Wave. I also like the new Disney Tron game -- it looks and plays well, even on the iPad.
I love Zinio and have several magazine subscriptions. I've also got all 3 major ebook readers (iBooks, Kindle, and the B&N eReader), but iBooks is my go-to app.
iCabMobile is an awesome browser -- with it, I can download PDF's off the web and store them directly into iBooks for later reading. No more going to iTunes and dragging/dropping on my Mac.
Flipboard is pretty cool, and I'm really happy to have Stumble Upon on the larger screen.
DocsToGo, Evernote, 1Password, iSSH, and EasyTask are my most-used utilities.