Hotbot was the best. I still miss it, because Google sucks.
If you still miss it, you stopped using it because it became useless. And that's what happened to it before it was shut down, because it had no meaningful concept of relevance. It just searched for your terms and produced whatever were the first results. It didn't try to do anything clever on your behalf, which is now necessary due to the size of the interwebs. It just returned pages and pages of too-similar results.