Just my 2₵:
QuicKPic -- Because stock Gallery just sucks so bad.
Ghost Commander -- Every OS needs a file manager, and this is one of the best. Great for rooters, too!
Wuala -- Like Dropbox, but with decent security features.
Android Central app -- Duh! Keep up with your fav devices and Android rumors on the go.
Hacker's Keyboard -- Awesome general purpose keyboard. Extra-must-haavy if you are on a tablet.
UltraChron LIte -- Whether you are drag racing or baking dinner, this stopwatch/timer combo app is well designed, lightweight and pure awesome.