As noted above, neither the 1935 nor the 1945 have wifi. The 1945 has bluetooth, while the 1935 does not. If you want wifi incorporated into the unit you might consider waiting for the
h4155.
Here is a quick comparison of the h2215, h1435, h1445:
h2215 - 64RAM/32ROM, 5.1oz, 400MHz, reg headphone, 12hr, 3.5" screen, cradle, .61"thick, PXA2555, bluetooth, CF, PPC premium, great screen
h1935 - 64RAM/16ROM, 4.4oz, 203Mhz, 2.5" headphone, 8hr, 3.5"screen, no cradle, PPC professional, .5"thick, slightly yellow screen when viewed from angle
h1945 - 64RAM/32ROM, 4.4oz, 266Mhz, 2.5" headphone, 8hr, 3.5"screen, no cradle, bluetooth, PPC professional, .5"thick, slightly yellow screen when viewed from angle
9/20/03 - edit - modified to indicate no cradle for h1945. Thanks for the correction.