I've posted a series fo photos of the Treo 600 GSM at http://caslis.com/devices/treo600/ .

There is a gallery of photos on the packaging of the Cingular version, a gallery for the packaging on the unbranded GSM model, and a gallery of close-up photos of the Treo.

Hope this helps anyone wondering what the differences are. The visual differences are only a cingular logo on the box, a cingular getting started manual, and the cingular logo displayed turning the wireless mode on or off.

Actually the cingular version is a better deal since it includes a much nicer case. The case in the unbranded one is just like the Sprint one, very minimal. The cingular case is much thicker and padded. It a horizontal design that has a basic belt clip integrated into it.