HP files three more possible Palm tablet names: Touchslate, Touchcanvas, and Duopad

HP has been burning through US trademark filings over the past few months, presumably hoping to nail down as many possibilities for the new Palm webOS tablets as it can -- a "shoot first, ask questions later" type of situation. To that end, it's filed for three more under a very broad computing category that could definitely include the Topaz and Opal models we've been hearing so much about: "Touchslate," "Touchcanvas," and "Duopad." We're pretty lukewarm on the unwieldy "Touchcanvas," but we guess both Duopad and Touchslate could work under the right circumstances. Then again, what's wrong with Topaz and Opal, really?