Here are the things I've added to mine that I found worthwhile (since 25 Dec.):
-Kindle--because I have a K3.
-Google Books--It only seems right on an Android device.
-Cool Reader--Good multiformat reader
-Mantano--For ePub, maybe, I haven't decided yet.
-Facebook--Doesn't everyone?
-RedLaser--I always wanted to scan bar codes.
Almost anyone should have these on board.
Other things specific to me:
-Slate--news fix
-Xfinity--only one TV has a guide
-Canon EPP--I have a Canon wi-fi printer
-Solitaire--time waster
-AndFTP--still doing setup--non-simple
-My Paints--doodling
Those are for specific tasks I do that other people probably don't.
I'm also going to add an RPN calculator app, but there are several and I haven't decided which one yet. Almost anything should be better than my HP33S. (Yuck! Silver, plum and pine? Chevron-shaped keypad? WTF were they thinking?) I'm leaning towards a straight-up HP15c emulator, but there's a nice extended calc with a zillion unit conversions built in that looks interesting.
Incidentally, if you import bookmarks in a Netscape bookmark file, use the file:///sdcard... prefix to get the browser to see them, then add the bookmarks manually.
Regards,
Jack Tingle