Off topic, but I use this computer for AF, so anyway....
I just plugged in my wireless optical intellimouse into my laptop. It's USB and has a sending distance of 6ft so you don't have to worry about where the receiver is. The coolest part though is I'm sitting here on the couch with my laptop using a full sized mouse on the blanket. It's got folds, bumps etc from sitting on the couch and still transmits perfectly to the computer. I can even use the t-shirt on my chest in a pinch. A nice addition for those laptop people who are working in odd places.
My other favorite gadget is a USB LED light for my laptop. It's got a 16-18" flexble metal arm that can be positioned anwhere. Great for keyboard light at night. I remember in Moab everyone was downloading pictures to their laptops and with the fire bans they were working by the screenlight.
Two good mods for the mobile computer Xterra owner.