Way back in March, Palm cofounder Jeff Hawkins alluded to the fact that he was working on a mysterious third product category for the company, but we really haven't heard much about it since. (And frankly, that's quite a feat given Palm's horrible record of keeping its product announcements a secret, but I digress.) However, yesterday, a former vice president of product planning at Palm, Michael Mace, asked Palm CEO Ed Colligan if the project was still a go, and though he was quick to move on to the next question, Colligan said yes. You can read more about the exchange on Michael's blog. We do know that it's supposed to have advanced multimedia capabilities and that it's neither a handheld nor a smart phone. Hmm, do you guys have any ideas as to what it could be?