I have a Belkin Bluetooth Adapter (F8T012) that I originally got for my PowerMac G4. It's been working with my Quad for a while now because for whatever reason the stock BT card has some latency. Works well with my Magic Mouse. However, I've never been able to use more than one BT device with this adapter. I did a little testing today and it seems that this is because I've had the adapter plugged into the USB slot of the keyboard. With it plugged in directly to the Quad in the front slot (all by itself) I am able to use both my MM and my Beats headphones without any issues. But with the stock Apple BT card, I still have issues. My understanding is that Apple limits BT connections to 7, while realistically you should only expect 3-4 connections. But the stock BT can't even handle two! Why is that? Are the cards in the G5's just that lame? The Belkin adapter by the way uses a Broadcom chip. Perhaps that may be why? I have the same stock card and the same issues in my 2.3DC G5 too so it can't be just an anamoly with my Quad. Here's what the Belkin adapter looks like if you're curious. I'm just curious why the third party adapter would be functionally superior to the stock Apple hardware.