Trademarks offer a lot more benefit to the consumer than any other IP. Allowing people to use other people's trademarks is like allowing you to use other people's signatures.

Everything else, I'm totally fine with. If you're better at using and marketing my code than I am, fork me over at will. Just don't pretend to be me.

edit: also, if you can exploit my code so much better than I can, consider hiring me. I'm cheap, I don't need a lot of space, and I'm extremely familiar with your codebase.