oManual looks interesting, I hadn't seen it before. Instructables is proprietary. I'm not sure about "open hardware hub" (new to me too), but it also appears proprietary at a glance. OHAI-kit is a bit different than just instructions, as it is also tracking times, so data can be collected from the assembly line. We don't mean for OHAI-kit to be an instructables-like contender, it serves a different purpose. That said, an open instructables-like site would be very nice to have.
Thanks!
-Jeff