I guess I'm against the grain here...

I, personally, will always go Open Source over Proprietary any day of the weak. It's worth losing a few features that I can then implement myself if I really need them to me to support an Open Source project. I pick the FOSS project that closest resembles what I need and then expand from there.

Obviously I won't not go if they use vBulletin (double negatives are fun), I come here don't I?

I also do not think it's a good idea to move t.m.o to meego. At least, not at this time. Meego is still in it's infancy and doesn't need this atmosphere just yet... it needs a smaller dedicated group of people that are willing to visit a separate forum to discuss it. (I'm not saying it just needs Dev's.. it needs people like Kathy too for end-user perspectives. So I'm not isolating you Big Bear )

As far as single-sign-on, I don't know about that. For the same reason as above - make it *too* easy to go over there and it just becomes noise. MeeGo doesn't need flame/troll/bait/complaints.. it needs people willing to move forward and work on a specific goal.

OTOH, it's likely that eventually some form of merger between the two will take place (at the least a SSO solution to be made) - especially if people (like STskeeps) backport or maintain a MeeGo port for the N900, for example. But.. this also presents the perfect opportunity to do what some people on these forums have been crying for: A separate forum for (the now) "Maemo" people (770/8x0 and maybe the 900) will stay here.. while the "MeeGo" people will go over there.

So anyway.. I guess in summary:

Always FOSS.
Start fresh. Don't move content.
Don't think we need to be overly concerned about SSO *yet*.. though it'll likely be needed eventually.