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For all the Mac people out there...
I have a Powerbook G4 17" which has Bluetooth built into it. There was no installation required. Simply plop in a few batteries and have your Powerbook search for new devices. Done!
Regarding battery consumption, I've been using this setup for 3 months and have used two sets of batteries for both components.
The keyboard and mouse do powersave if your computer goes to sleep or after a few minutes of activity. A simple nudge will wake them up and it will stream all your keystrokes in once it comes to life.
If you have a Powerbook and a good supply a batteries, this setup will give you great mobility or suffice as a would-be docking station.