If you have source code in Subversion, Mercurial, Team Foundation Server, or another Git repository, you can now quickly and easily move that code to GitHub with the GitHub Importer. It will move your code and then notify you (via email or in your browser) when your newly populated GitHub repository is ready for action.
Access the GitHub Importer directly from https://import.github.com, or use the import feature to migrate your code when you create a new repository on GitHub.com. Your repository will join over 400,000 that have used this feature to move to GitHub!
For more on migrating your source code, see "Importing your project to GitHub" in GitHub Help.