Double your pleasure

Twingine.com is a twin-engine search tool. Formerly found under the great and descriptive domain name "Yagoohoogle.com," it sends your search to both Google and Yahoo and displays the results in side-by-side panes.

The first few results are nearly always the same, for the half-dozen or so searches I've tried, but then it's interesting to see what one engine locates that the other doesn't. It's also interesting to see that some searches have noticeably different sorting in the results.