I am at a point anymore where I almost can't name favorites because I end up omitting. I like GoodReader, yes, Stanza, Calengoo, Overdrive (new fave since I now just got in on the library book thing), Docs To Go (I have the regular version), Use Your Handwriting Gold, Smart Note Free, neu Notes, Noterize, Save2PDF, iBooks, iPF, Dictionary.com, a few word games and puzzle games are in the mix. I could keep going, and of course, I use the phone and safari too. I have many more that I like and can't possibly name in one sitting.
And DaveSt-LOL- of course you gotta have fun. That's what Snood and Jumbline are for me! (and my various solitaire and tetris type games too!!!)