I recently talked about Sphinxdoc and we wanted (still for MySecureShell project) a solution to host our documentation. ReadTheDocs is a very good, free and pretty solution made for Sphinxdoc :-)
What we liked in addition of the hosting, is the usage with GitHub. You can configure a webhook to your GitHub account to automatically ask ReadTheDocs to build a newer version each time a commit is pushed on your GitHub account.
