I picked up one of these at Micro Center:

http://www.amazon.com/Multi-Link-Bluetooth-Keyboard-Touchpad-GKM611B/dp/B004N7146U/

What I like:  It works well and it allows me to pair the keyboard with up 
to six devices.  I can switch between devices using Fn-1, Fn-2, ..., Fn-6. 
It has a touchpad on the right side with two buttons in front of it.

What I don't like:  The touchpad is only about an inch square.  It doesn't 
seem to do scrolling.  I have an IOGEAR keyboard that doesn't use 
bluetooth, but it has a trackball on the right and two buttons with a 
clickable scroll wheel on the left, and I like that much better.

What I want:  The best of both worlds.  Isn't there a bluetooth keyboard 
that allows multiple pairings and also has a much nicer design for the 
pointer movement (touchpad or trackball)?

It seems simple enough, but a lot of bluetooth keyboards have a separate 
mouse or trackball and I want everything built into the keyboard.

Mike