It is a Second Life toolbar which even has an embedded media player in there so you can listen to SL podcasts etc.*
Cool. Now podcast.com needs to get in there to supply it with its SL channel, and BlogHud needs a spot there with the RSS feeds from other sites...
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.