When HP announced it would release webOS as open source, it added a competitor to a narrow niche: there's already Tizen, the descendant of MeeGo, which is, like webOS, an open source Linux-based operating system for smartphones. Can they co-exist, or will one come out on top? One built-in advantage for webOS is that already has hardware, in the form of all those $99 TouchPad's being snapped up on eBay