I'd even be OK with "Thumbs Up/Down this result just for your own personal book-keeping", so that you can promote/demote results in your own search history (try searching for "_____ tutorial photoshop" and you'll get tons of splog links before you eventually hit a golden result. It'd be nice to save time later).

Google briefly had a feature like this in their results, but they've removed it. All that's left is the Star system, which isn't quite the same.