Well said, and nearly all points do matter - I think a good maintained open source project may even work without own domain, see tons of examples at google code which is just enough to have a project homepage that delivers.

thechangelog:

Apologies for the loaded headline. It’s a hat tip to the Twitter how-to articles that taught us the benefits of setting our avatars, writing a witty bios, setting a location, engaging your audience, and oh yeah, adding value. As a team that digs through a mountain of open source projects each…