One thing I never understood was why Intel doesn't simply partner with Canonical, Red Hat, or SuSE to offer a "netbook remix" of one of those distributions customized for Intel Atom. It seems like this would be much, much, more cost-effective and low-risk than trying to create a new distribution from scratch. Those guys have the expertise in setting up a Linux distribution and they also have a lot of folks who are willing to try out unstable builds and perhaps contribute to making them better.
If I were an engineer trying to build an embedded system around an Intel Atom, I would either go with Linux from scratch, or start from a well-known and well-understood distribution like Debian or Red Hat. I wouldn't bother to train everyone on the team on something completely new, which does pretty much the same thing as the old software did.
If the point is to sell into the phone and tablet space, then I don't see how Tizen can compete with Android and the other contenders. I'm curious if anyone has a different point of view, but from where I stand, I can't possibly see how they could succeed. It kind of pains me to say this because I know there are a lot of good engineers on the project, but that is how it looks to me right now.