GitHub is growing as an important web-hosting site for open source projects, being the most popular source code forge (more than Sourceforge and Google Code). It facilitates the duplication of existing repositories (there is not mandatory to be a project contributor to add changes, thanks to the pull-request tool), and integration with other development applications.
That is the reason we have migrated from Sourceforge to Github (appart from some bad practices of SF). The migration has been performed using svn2git tool, keeping all the previous commits, and mapping the Sourceforge users to Github users.
Check it out the repository in https://github.com/fergunet/osgiliath
And remember, fork me in github!