[anuraggoel]

While its a nifty service, Topsy seems to be 'static' search for Twitter - another version of "<search terms> site:twitter.com" (especially when you consider Google's time-range search options). A lot of people seem to be linking to tweets on blogs and forums, and the 'old-fashioned' currency of these links seems to be missing in Topsy (and present in the Google version). This omission could be an issue for their ranking algos when linking to tweets becomes more common.

If I were the Topsy team, I would also worry about Twitter adding a static option to their own search. Unless of course I am hoping to go the Summize route.