I stumbled upon this. I have probably been underground while everyone else has been happily using this extensively, mind you.
It is a Second Life toolbar which even has an embedded media player in there so you can listen to SL podcasts etc.*
What a cool little metaverse tool.
Keep the cross over tools coming!
*Actually, on further investigation I think it is just a radio player – I am not sure if you can load it up with podcast feeds yourself. That would be perfect for me.