Gada - Tag Meta Search Done Right:

Gada takes a query and runs it against sites like Google News, Technorati, Flickr, IceRocket, Amazon, Wikipedia, 43Things, etc. Searches can be narrowed via a drop down box to “photos”, “social” etc. for more specific results. The search itself, and any narrowing, are also accompished via the domain name. For instance, a photo search for “web2con”, the tag people are using for last week’s web2.0 conference, is also accomplished by the URL web2con.gada.be/p. The query is the subdomain, and the photo filter is the /p at the end.

(Via TechCrunch.)