1. Well, considering there's Android coming for the N900 I'm content with my choice.

2. If you're looking for a huge app store you're probably better of with Android.

4. MeeGo will be ported to N900 too, though not officially by Nokia. There's still apps coming, if that's what you're asking.

5. Battery life varies obviously, some get 4 days, some get 12 hours. Depend on what you have running(just like a laptop). I get about a day of battery life, meaning I charge it every night.