We're personally looking forward to the Vista-capable HTC Shift for our UMPC-from-HTC needs, but this HTC Omni seems quite nice from the renders. It has WM6, 3G UMTS/HSDPA, a 4-inch 800×480 display, TV/VGA out, 256MB ROM, 128MB RAM, microSD expansion slot, 802.11b/g, Bluetooth, GPS, a large QWERTY and a size of 130 x 81 x 16mm.
