Geez, it feels like every third blog entry I make these days is about search engines. Maybe that says something?

Anyway, check out these two cool sites I found:

Twingine
Type in a search string, and it shows you Google & Yahoo's results side-by-side. Very useful if you plan on searching on both sites anyway (e.g., extensive research projects)

Google vs. Yahoo
Same idea, but this one's more graphical. Put in your search string, and you get two rows of dots, Google's results on top, Yahoo's on the bottom. Lines (literally) connect the dots for where the same pages are returned. Vertical lines near the left of the graph signify agreement between the search engines about what's most important. Severe diagonal lines signify disagreement. White dots (with no lines) signify sites that were returned in one engine, but not the other.