Lessee - I second Stanza - I've had some real finds in the online catalog.
I use the Weather Channel, NYTimes, and the Twitteriffic apps every day. Then there's Sol Free for solitaire and Flood-it free games.
For learning Japanese there's the free Kotoba! dictionary, ShinKanji Lite, Japanese essentials Lite, and Word Power Lite - I don't think I'm going to be upgrading those last 3 (I have other full apps that I did buy).
Oh, Distant Suns Lite! Great astronomy app (I upgraded that one).
If you're of the Liberal persuasion, you'll like the Huff Post app, too.