This Friday, March 29th, I'll be giving an "Ask a Pro" online webinar on PhoneGap Build. I'll be talking about the site and demonstrating how to use it -- both by itself, and with Dreamweaver CS6 and Edge Code. To attend, simply register at the link below.
Building Mobile Apps with Adobe PhoneGap Build

Archived Comments
I tried to register, but all I got was "413 Header Length too large".
I will try from another browser (currently in Chrome) and hopefully get to see the webinar.
If you have any issues, ping me on Twitter day of (right before) and I'll share the link. We don't share the main link cuz we want folks to register, but I'll help you out if need be.
I noticed another service returning the same thing. I believe it is an internal issue that should clear up soon.