Screenshots, videos, animations, case studies, a blog, a link to the actual thing... There's a lot of ways you can showcase your projects in your portfolio.
Sorry to all the people who asked to join the branch, but I have to close it down before it becomes too long and unreadable. But if you want to continue the discussion feel free to fork the branch yourself!
I will also write a summary of the main points on the Folyo blog (http://blog.folyo.me) soon. Stay tuned!