Considering what happened to Muxtape, it's no big surprise that Pownce.fm wasn't launched, even if the acqusition hadn't gone through I'd wager..
I agree, I just think it is interesting to see what internal projects never get released that the developers spend a significant amount of time an energy on.
It's a side of start ups that isn't talked about much - what technology disappears when a start up shuts down?
Oh, totally. I love posts like this whether the underlying product made any sense or not. We need more "behind the scenes" type stuff like this so your submission is spot on :)