I recently found this new license type for writing software. As I read it, nothing says you can't just make your source code "email me for the source."
http://www.opensource.org/licenses/ms-pl.html
While I don't know that I want 10,000 hits requesting my source code for any of my projects, it could be a good way to do things. Alternately, if you have an email auto-responder through your web host, you could just setup one of those to auto-respond to any requests with a zip file of the code.
