I got mine yesterday. I tried playing music from my HD while playing MGS 4 and it wouldn't let me. I don't know if that's just something with MGS.
I also hear that the IR2BT converter got hosed by the 2.40 update. For some reason, you have to turn the PS 3 on with a controller or on the front of the unit. If you turn it on from the IR remote, it won't accept any commands.
Thanks again Sony.