I love mashups. I love tools that combine two great things into one very cool thing. Widgets might be the defining technology in 2007, but mashups — despite their apparent prevalence in our Web 2.0 world — will continue to pop up and astound me.

With that, I introduce what I just discovered: Delexa. Delexa is a domain-ranking engine that allows you to see information on the top 50,000 websites (ranked by Alexa) and their topic tags (ranked by del.icio.us). The result is pretty cool:

If you search for the top SEO sites, you see 100 websites grouped into three columns: a Delexa ranking, the Alexa rating, and the number of tags that reference the particular website. For business research, this is a pretty neat tool to get an idea of where you should look (whether for competitors or for related resources) and how they are ranked in a very friendly and usable format.

I’m digging the clean look a lot and can see this to be a really good resource for people who want to find high-ranked sites on a similar subject matter as defined by tags.

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