I am looking for a remote control to use with presentations on my 12 inch PB. I am considering the Keynote Express (but I've heard negative things about its functionality with Airtunes -- not sure what that might mean for PowerPoint -- and I am not sure IR is the way to go), the 1-button BT Apple Mouse, or another BT mouse (i.e. something with 2 buttons and a scroll wheel!). Advise? Experiences, good or bad? P.S. (If there was a BT Mighty Mouse, I'd have it already).