Navman’s new iCN 510 is a pocket-sized GPS unit with a QVGA screen and a magnesium case. By default the unit comes with 32MB of map memory, but it accepts SD/MMC cards for expansion—up to a gig (and probably more). And despite this image clearly indicating a more Euro flavor, the iCN 510 will come packaged with a U.S. map set when purchase here in the States.
Unfortunately, the $450 unit isn’t on Navman’s site yet, so I don’t have exact dimensions. The screen is 3.5-inches, though, so you smarty types can extrapolate from there, need be.
Navman iCN 510 Pocket-sized Portable GPS [MobileMag]