As many of friends, I recently acquired a HP Touchpad largely due to its low price. I don't really need a tablet, as I am sitting in front of computes almost all the time. My original plan was to turn it into an interactive cat toy, at least sometimes, so I can keep the two cats entertained while I am working.
Unfortunately, I could only find one game designed for the cats "The Catnip Collection". According to its website, it "is a variety of toys that will amuse and challenge your cat and its human".
The reviews seem pretty decent (4 out 5).