I slightly agree about CLAs. Contributor Licence Agreements are largely ignored by most small open source projects because they're a pain in the ass and prevent contributors from contributing.

However, I think they could go further than the support discussed here. It would be great to see CLAs tht you could get asked to sign when you make a pull request. You could also make it easy to sign - maybe instead of printing and scanning, you could sign using a PGP key.

If Github incorporated this stuff, every project could seamlessly use CLAs.