Great list! I've been wanting to start using a smaller search engine with its own index, just for the sake of making sure there's an alternative to GBY. (Also, there's a new and useful acronym, haha.) Mojeek was the only one I was aware of before today.

BTW, exalead.com doesn't seem to be a search engine anymore. I recognized that one because I remember discovering it a while ago...in 2007, maybe? But it looks like it's not available as a regular search engine now.