The simple answer to your question is YES, if you have Leopard.
Let me explain, I have an iMac with OS X 10.4 Tiger and bought a SONY CMTHX5BT to stream all my iTunes music to. I then found out that Tiger does not support the AVRCP BT protocol. I downloaded a trial version of Audio Gateway by Softick. This allowed me to stream to the SONY. However, there were quite a few pauses during the streaming so I didn't pay $20 for it, I just let it expire. I was hoping to find a different solution. I wasn't sure if the problem was the iMac BT range or the software. Any suggestions from anyone else would be appreciated.
Now about the MBP. I just got a MBP with Leopard last week and the first thing I did was try Leopard and see if it would stream to the SONY which it did. Only problem being, the quality of this stream. Even with the MBP right beside the SONY, the pauses and hiccups were TERRIBLE, very very bad so not impressed so far.
I am now trying to solve both these issues but as I said the simple answer is yes.