[EDIT : I asked if there really was a kickstand since I didn't see it in the pics, but here you can see it : http://www.youtube.com/watch?v=RP5R-5NX1BE]

Also, your comparison lacks one aspect, which is a big downside of the N900 : the dimensions :
iPhone 3Gs : 115,5 x 62,1 x 12,3 mm - 135g
N900 : 110.9 (-4%) × 59.8 (-4%) × 18 (+46%) (19.55 at thickest part = +59%) mm - 181g (+34%)
So it's way thicker, and weighs significantly more.
See what it really looks like here (the thickness doesn't show the thickest part, for the N900)

but I'm still not even touching the iPhone and definitely buying the N900 if I have the funds and the reviews don't provide me an excellent reason not to buy it.