duckduckgo is pretty good. <a href="http://donttrack.us/" rel="nofollow">http://donttrack.us/</a> is a decent piece of marketing. Overall they have a really good momentum, and are probably the most promising.<p>Blekko has some nice features too. It'll give you pretty good information about a site with the /seo search tag. I find it interesting to see that information. I know it can be obtained from other sources though.<p>I haven't heard of Stumpedia. I'll have to check it out sometime.