I have posted my review of the Microsoft Wireless Optical Desktop for Bluetooth. Here is an excerpt:

As much as everyone likes to plug everything in immediately when they open up a new hardware product, in this case you must install the software first. The software included is a special version of IntelliType Pro and IntelliPoint. Specifically, they are IntelliType Pro for Bluetooth and IntelliPoint for Bluetooth. Install the both software programs as normal, then you can detach your old hardware devices and plug in the desktop base. Make sure by this point you have already put the AA batteries in the mouse and keyboard. You are ready to go! Note: IntelliType Pro and IntelliPoint for Bluetooth only work in Windows XP with SP1 and the Windows XP update for Bluetooth. Not to worry, these updates are also included in your software CD.

Updates:

Here are the answers to the questions I've been getting recently about the Desktop. First, unfortunately the keyboard/mouse does not work in the BIOS screen - you get a keyboard error message. The first time you get a response from either device is at the Welcome screen. Second, if you have enough ports you can actually have two mice and keyboards working at the same time. They do not conflict with each other. Third, I went in a different room on a different floor and both devices operated normally. Fourth, if you live in an apartment building bluetooth devices will not conflict with each other because there is a specific passcode you have to retype to lock in the settings between the devices. If you have any more questions, do not hesitate to ask!