@Addison
Seriously that extra stereo plugin (included with XMMS) and voice removal plugin work pretty well.

For Pidgin I use:
* autoaccept
* buddy state notification
* history
* message notification
* n800 led plugin (BLINK on laptop)
* psychic mode
* purple-shout
* send button (should be built-in the maemo build)
* offline message emulation (not needed on new builds of pidgin)

and I occasionally play around with other ones.