Same here, but I was trying to use it for Pandora. I gave up.I tested out backgrounder with Fring to see if I could use Skype In even when the iPhone was in sleep mode. I found that it eventually cuts off the wireless, so I couldn't get a full test(it accepted calls for about an hour though).
I even tried with insomnia, which is supposed to keep wireless active even after the iphone is asleep. . .but it still didn't work
It's well-documented that Beejive won't run in the background using backgrounder for longer than a couple of minutes. Problem with system memory or something if I remember correctly.
I'm going to test running Nimbuzz in the background.
How to track the applications running in the background as some times I enable background and forget to disable it..