Harry McCracken of PC World just got a Verizon Droid to review and he started by comparing it to the iPhone. While it is beyond the capabilities of this community to send him an N900, perhaps someone more knowledgeable than I could put together an N900 column for his comparison chart. Please note that any discussion of openness should be limited to 50 words rather than 500 posts.
Here is another chart that the N900 needs to get onto once it hits the US market. Billshrink is a reputable outside source for phone and plan comparisons in the US.