Not that a "Gphone" or Android-based mobile phone is available today but the the Open Handset Alliance around Google's Sergey Brin and Steve Horowitz just uploaded a couple of videos to YouTube which shows how an Android-based mobile phone could look in the future.
If you watch the video bellow, you might notice for the first non-touchscreen device a kind of back and home button, similar to the button-layout we've seen with Windows Mobile Standard phones. The second phone platform Steve Horowitz showcases is a touchscreen smartphone with 3G capabilities:

Definitively an interesting video and it shows where Android is going to - most likely. It's not groundbreaking (yet) and it picked-up some elements we've seen at other mobile phone platforms like Symbian and Windows Mobile already but I'm definitely looking forward the final product. However, it still take some time until we will see the first mobile phones released (at least 9 months). Until then, you can either start to develop your own Android applications, thanks to the today's released SDK or you can continue using your Windows Mobile smartphone (what I will do).

Cheers ~ Arne