I have a Apple Bluetooth Keyboard.
I tried so hard to connect it to my N900 back in november, but no luck.

I will try again, if tattergreis did it, why can't I? Maybe the firmware updates fixed that from november til now.

Anyway, if you OP can, try the apple keyboard, is a joy to use, and I have it as my main keyboard at home, using it for programming and writing etc, so it is in heavy use all day long, and I find it to be a very good keyboard.