Ah, the joys of optical mice...

I made the switch, and I'll *NEVER* go back
One thing I've found out the hard way... they don't like surfaces with highly contrasting patterns. A zebra-striped mousepad would not be a good idea, or an oak surface with nicely defined grain patterns. I've got one table that the grain patterns cause the mouse to jump all over the place. Dull and boring is best...
Hope you're feeling better soon, Cloudy. I was down (but not out) earlier this week, and it truly sucketh.