I was able to clone a copy of this repo over HTTPS authenticated. I\'ve made some commits and want to push back out to the GitHub server. Using Cygwin on Windows 7 x64.
I think @deepwaters got the answer correct for older versions. The HTTPS URL needs to have the username. I had git 1.7.0.4 and git push origin master wouldn't even ask for a password till I added it.