Eh, if the N900 had a decent amount of developers and apps available, even just a small fraction of what Android has in the Marketplace, it would be much better off. I've considered doing the same thing as the OP, and dropping my N900 and throwing the SIM in a Nexus One. My wife has a Droid and even without true multitasking and a command prompt, the apps make it worth it. Navigation is top notch, the video games rock, Android has Trapster (heck, Blackberry has Trapster).

I love my N900 and I use the heck out of it everyday, but it has not caught on with developers and there is a sever lack of apps for it. I might go for a Nexus One as well if I can find a decent price on one.