sknebelhm, wasnt there an example of a handwritten (as in picture of handwriting, not "I wrote the HTML in notepad") website a while ago? That should have a comment-fax option :D
[schmarty]if you have access to the _private_ key (or SSH agent) you could spawn an SSH connection to `mailto:git@github.com` - on a successful connect github replies with a success message containing the github username associated with the key.
[tantek]wait, isn't it a *bad* thing for someone else to have access to your private key for GitHub? because then they can pretend to be you on GitHub right?