I have been using three tools on a regular basis that I think complement Google:
- WhosTalkin searches a variety of conversations including twitter and blog feeds. It’s handy, quick and claims “Our search and sorting algorithms combine data taken from over 60 of the Internet’s most popular social media gateways.”
- SearchCanyon is useful if you really want to drill down on a topic, you can click on intermediate results that were useful to refine your search. I find this approach to be more useful than Clusty.
- Keskese searches Google, Bing, and Yahoo in parallel, it’s lightning fast, and overlays a set of suggestion keywords to help you to continue to refine your search. I think it’s more useful for “mapping out” a search, where SearchCanyon allows you to drill in much more deeply once you know what you are looking for.