Yes, I have tried Apple Bluetooth Keyboard wih N9. Result did not surprise me after all the troubles with my kbd and n8x0 and n900.

N9 sees kbd with no troubles and looks like it pairs ok. Kbd does not notice it is paired, keeps flashing led. No luck.

Previous experience suggests that there might be variants of Apple kbd model. Mine has been always very tricky.

-n8x0: very tricky to get pairing succeed. Got to do everything in just right sequence and timing. Once paired, works ok.
-n900: semi-hard to get paired. Once paired, does not work without hid-apple.ko, which is *not* in n900 kernels by default. With hid-apple.ko sometimes works just by turning kbd on. More regularly needs one bt disconnect-connect sequence.

I'm not planning to try 50+ pairing sequences with n9 like I was once forced to do. Life is just too short and bt kbd too cheap if somebody can confirm working model....