rdesktop cli
mplayer
media streamer + Tversity on your pc = WIN!
streamtuner
EmelFM2
Mytube (5 stars)
Quiver
greasemonkey & select scripts for microb
Maemopicasa (if you have a picasa account)
Tyrian
Edit Internet Searches (just used 3 times so far, but very useful)
Kerez (5 stars)
Configuration editor
USB Control
GPE suite + Erminig
Comix
Nicotine (very slow, but the only Soulseek client available)
GTK-Gnutella (gnutella & limewire for maemo)
Vagalume
Buoh (just got this, but it's already become one of my favorites)
MH Shot tool