I just joined the Windows Embedded Developer Interest Group (WE-DIG), based here in Seattle for now. It's a group of embedded developers who use Microsoft technology - that includes Windows CE, Mobile, and of course, XPE. Our first meeting is set for September 1, 6:30pm-9:00pm, on Microsoft campus - if you find yourself in Seattle around that time, drop me an e-mail and I'll give you directions and make sure you can get in. The meetings are open to all embedded developers, not just MS employees - in fact, the group was spearheaded and is being led by Paul Yao, an eMVP who focuses on CE development.
I'd also encourage everyone, even if you can't get to Seattle for the meetings (first Wednesday of every month, same time), to go to the WE-DIG web site and sign up. We've got plans for original content, a wiki for everyone to contribute to, and regular news items. Everything's RSS enabled as well, so once you've signed up, you can keep up to date in your favorite RSS reader.
There are plans to expand WE-DIG to other cities - we've got some people interested in setting it up in other locations as we speak (or as we type and read, whatever). We want to see how this works in Seattle right now, then we franchise.