I've been really curious about doing this with the pearl too, and I just came across another program that is similar to that mobilia thing you mentioned: SourceForge.net: SmartCam
It says its for symbian OS on the first page, but download it anyway, because it also includes a Java version you can upload to the phone. I got it on the phone, and I ran the client app on my PC, and I can tell the app on the phone to connect to my PC over bluetooth, but the connection stalls and then fails. It almost works because the app on the PC says its "Connected", but that's as far as I can get.
Anyone else want to give it a try? I'm wondering if it's because I'm using Vista or have the wrong bluetooth stack, or just something related to my setup.