I have created an Adapto project on SourceForge with a project blog, documentation (Wiki), support Forums and Mailing Lists, and release packages for download. See http://sourceforge.net/p/adapto/blog/
My first experiences with creating a SourceForge project are generally positive, although:
1) the Wiki is not MediaWiki compatible. Perhaps I added the wrong Wiki type to the project, perhaps I needed to create a Classic project, or perhaps it just isn't anymore. Either way, importing content from my Community Achievo/ATK wiki may be more difficult than I thought (although I'm still investigating). Also, it doesn't seem possible to upload images to the Wiki (but it does support uploading file attachments).
2) SourceForge is operated by a U.S. company, which means access is blocked to Cuba, Iran, Libya, North Korea, Sudan, Syria IP addresses (I also learned about encryption export controls, which after some research I don't believe apply - see my blog post http://www.dalescott.net/wordpress/?p=865
Github and SourceForge both provide basic static HTML web pages and Wiki's, but Github does not provide Forums, Mailing Lists or Blogs, so if we want any of these features they will have to be hosted somewhere (if anyone other than me thinks Mailing Lists are a good idea, you better speak up!), and SourceForge seems as good a choice as any for a community project. However, I'm interested in your experiences with project hosting and opinions on the SourceForge project. I'd like to move fairly quickly if possible - it's not fair to iBuildings to be using their resources for discussing Adapto.