Earlier this afternoon Google announced SearchWiki, which is pretty darn cool:
Have you ever wanted to mark up Google search results? Maybe you’re an avid hiker and the trail map site you always go to is in the 4th or 5th position and you want to move it to the top. Or perhaps it’s not there at all and you’d like to add it. Or maybe you’d like to add some notes about what you found on that site and why you thought it was useful. Starting today you can do all this and tailor Google search results to best meet your needs.
This is great for research. (Though it’s less useful for egosurfing, I do have to say. :P) Make sure you watch the video on the announcement page. Dang, this is sweet.