I think my right hand is permanently curved into the shape of the mouse - sad, isn't it? I have an optical mouse too, but it's wired. I should probably get a wireless keyboard at the very least, so that I can type properly when the kitty is on my lap - I end up having to type one-handed, because I turn to the left and put my feet up so the kitty can lay on my lap, and then both hands can't reach the keyboard! Maybe I'll just design a keyboard with a beanbag on the back, like a lap desk, so I can rest it on the kitty-lump that's always on my lap