I will add my two cents. I have an N770 running OS2006. I go my XTBTUEI keyboard today. The $29.99 one on Amazon. This is not the XTBTUE model, whatever the difference may be.

All I did to get it to work was install the Bluetooth plugin. As I understand it, I only need to do this because I am using an N770 and OS2006. I opened the keyboard, put in the batteries, pressed and held ctrl-blue-green and told the Internet Tablet to connect. It did, and I could type. That is all there was to it, so I can also confirm this "Blackberry" model works fine.

A couple of other notes, when I got the actual keyboard, there was no mention of the Blackberry on the original packaging. The only place it was mentioned at all was on a barcode sticker stuck over the original barcode on the back. The original packaging on the front actually says ...
Ultra-Slim Bluetooth Keyboard for Smartphones
and on the back it says...
Truly Universal - works with almost any bluetooth enabled device.

So it looks, to me anyway, that it is just a regular bluetooth keyboard with maybe some special printing on some of the keys associated with smartphones.

Hope this helps anyone thinking about picking one up.