Here's the HTC G1 (a.k.a. Dream) sized up against the iPhone and HTC's Touch Pro: it's a kinda half-way house between them both. It's narrower, but taller and fatter—thanks to the slide-out keyboard—and lacks the deftly curved shape of the iPhone 3G, but it's a shade skinner than the Touch Pro. Looks it'd fit pretty comfortably in the palm. Check out the hands on to find out how it really feels.
Why would you show 2 of the phones in mm and one in inches?
116.84 x 54.864 x 15.748 G1
115 x 62.1 x 12.3 iPhone
102 x 51 x 18.1 Touch Pro
The iphone still has the smallest over all volume of the 3 by a good margin. The G1 has the largest by about 25% vs iphone.
Ill stick with the iPhone.