Android natively doesn't support the Bluetooth HID profile which would be required for this. So, your options are limited depending on whether you're rooted or not:

  1. (If rooted): This YouTube video shows the Nexus One connected to a Microsoft Wireless Entertainment Keyboard 7000.

  2. (If not rooted): Teksoft provide a Bluetooth HID driver (commercially, costs about 10 Euros), which is reportedly successful.

Note: Individual devices that run Android may have the HID profile added by their manufacturer -- for example, the Dell Streak supports Bluetooth keyboards.

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