quick side note:
I think one of the really great new features is the swap space on the N900.

As an ex-iPhone developer I can tell you, there is no swapping of any kind on the iPhone. If you run out of memory, the system will kill you off. On the 3G and 2G iPhone memory (or lack of) is really a big issue.

We also develop for WinMo. There is no swap space or anything like that either. But I find WinMo devices handle memory management better than the iPhone.