I hardly use Pownce, reason being, I use twitter for micro-blogging and facebook and youtube for sharing videos and music with my friends.
The Pownce AIR client is a smart way to encourage more people to use Pownce. Just drag n drop files or post notes and send them to all your friends.
For those Pownce addicts on linux, till Adobe comes out with AIR for Linux, check the KDE4 Plasma Pownce widget (plasmoid).
Unfortunately, the pownce API still does not support posting notes, so this will only let you view notes from your friends.
Watch out for more cool features, when the author updates the widget.
Check out the screenshot..
It looks very similar to the KDE Twitter widget.