USB bluetooth dongle

I want one of these for my computer and I unfortunately do not know anything about them, can anyone tell me what to look for?

I got two sitting in my closet... had no use for them.

I bought one for $4 shipped from a seller in Hong Kong on ebay, just because it was cheap and wanted to play around with it Only use I've found so far was transferring contact list from my mothers cell phone... mine doesn't have bluetooth.

You might want to start looking here: http://www.bluetooth.com/bluetooth/
This might give you a general idea of what it is that you really want to do.

Some stacks have better support then others.

ie: Logitech bluetooth mouse software doesn't support Toshiba stacks.

The basic mouse functions work but you can't program the 3rd button, etc...

So before you buy check the dongle's chipset manufacturer.

I've found that MS ones seem to be easiest - plug and play with XP SP2.