Help with bluetooth Dongles

Could you please tell me which of these can connect to multiple devies at the same time(many retailers sell a few that connect to 7?)

Also what are the transfer rates of these?

Thanks.

Sorry about the double post but its been a while - so BUMP.....

Note. I have also found out that Mobiles transfer a max of approx 768kbps......
so which of your bluetooth dongles will support more than 1 device at a time i.e. Mobile Phone sync and using bluetooth headset as a headphone....