When I first signed up for Pownce it was probably a few weeks after I had started to use Twitter. I sent my Twitter updates to Pownce, because I was too lazy to update in yet another place. I checked in every week or so and never generated any traction in my user base, so after a couple of months I just started ignoring it, other than the occasional email from Leah, with a link to some image of mp3.
To me it seems like Pownce died about 6 months ago, and has been limping along on life support, it’s the decent thing to do—pull the plug.