3G/2G/Dual Mode selection Applet
Save's battery.

AdBlock Plus
Speeds up surfing.

AutoDisconnect
Set min.req for use of datalink, if not disconnect.

Extra Decoders Support
For the mediaplayer.

Headphone Daemon
If you don't want it to keep player after you unplug..

That is the ones I use on a daily basis.
Nothing new.