Twitter search sites: The best and the rest

Twazzup is a very useful and flexible Twitter search tool that does almost everything that Twitter Search does, as well as providing a few columns of algorithmically generated results, such as most the influential tweeters on a topic, related photos, and a great list of keywords based on your search results that you can use to refine your query.

Unfortunately, the Twazzup results page can be overwhelming to read, and it only searches Twitter.