It will be a bit off the topic.

What's wrong with all those who wants to change OS? DId you buy the hardware and now start to complain there's no future for it?(yea I know about definition N900 is computer like, you buy hardware and then choose software to use)
Sorry, but I knew what I chose when I bought N900. And actually I feel very satisfied with what I got. I like Maemo5, I like N900 hardware although I don't overestimate it.

So I question again? Are you so unsatisfed with Maemo5, all its capability and features?

NITDroid is what I would never want on my N900. Why would I? Moreover, I would prefer to buy dedicated device if I want to.

Almost the same goes for MeeGo. While I see a long future for it, I don't see the reason to install it. What do you want to see there? I suspect it won't offer something new for us - same or even more stricted functionality compared to Maemo5, just more fancy UI. Even so, why would I want to change from Maemo5 to MeeGo if they are equal in terms of functionality? Personally, I'm not the big fan of all that cute transitions and etc. Moreover, I really like Maemo5 UI and the possibility to tweak almost everything.

Speaking of software, I actually already more than happy with what Maemo5 offers me. Yes, there are some aspects of phone usage,where our beloved device couldn't compare to others. But I adjusted to it, it fills my needs enough to be happy with what I have.

So you probably guees my verdict - why be so unsatisfied and try to fill your needs by others?