If you don't write code, you can stop reading now.

Last May we launched a new service for Project Hosting on Google Code at Google I/O: hosting for the Mercurial version control system! Our Mercurial implementation is somewhat unique in that it doesn't use a traditional filesystem for storing data, it uses Bigtable instead. This allows wide horizontal scalability to host thousands of repositories, which my co-worker, Jacob Lee, explained quite well in his Google I/O talk. Since then, we've added support for server side repository cloning to allow projects and users more flexible working methods.