US folks can now pre-order the Nokia N900 at Nokia USA. It’s a bit tricky to find the N900 at the site so it might be easier if you follow this link. Edit: Official link.
The unlocked Nokia N900 retails for $649 + tax, with a free BH-703 Nokia Bluetooth headset, and shipping early October. Note however that while the N900 will work on both T-Mobile and AT&T for voice calls, 3G data speed will only work on T-mobile. The slower EDGE data speed might work with AT&T though.
There is no word yet if T-mobile will officially carry the Nokia N900. If they do, you might want to wait a while as they will surely offer it at a lower, subsidized price.
[...] in any case, I’m sure that this will make some folks happy. Question, pre-order now or wait for an AT&T subsidized [...]
it is not that tricky to find N900 on Nokia USA site
use http://www.nokiausa.com/n900 and “buy now” button – it is VERY old trick 
Thanks. Nokia did update the N900’s product page shortly after. I’ve updated my post.
For a device of this stature, I don’t know why nokia doesn’t include a 3G quadband too. I think the G1 does that.
[...] folks, if you have been wanting to get some hands-on time with the Nokia N900 before you pre-order one, it looks like the Nokia flagship stores in New York and Chicago now have test drive [...]
[...] For anyone in the U.S. looking for a good deal on the Nokia N900, Amazon.com has the N900 listed right now for only $588.99 (no taxes with free 2-day shipping). This saves you about $60 from the original price plus it’s tax-free, but you don’t get the free Bluetooth headset that the Nokia online store offers. [...]