The cat has figured out that the battery on the happyMac is very warm. She now fights for position on my lap overlapping the battery when I'm using the computer on the couch. This means she occasionally moves the mouse or highlights text with her paw or nose. This can't be good. Also, positioning my wrists so I can type around the cat is not at all comforatble and probably will lead to carpal tunnel and/or tennis elbow. Hmmm.

I still think that working witha cat purring in your general vicinity is a good thing.