Summize is widely considered to be the best search engine for Twitter conversations.
Of course there are skeptics about the acquisition given that it was reported in TechCrunch:
"Want a good way to build a popular blog? Make up a story! According to “the sources” of what appears to be a high school student, Summize is being acquired by Twitter. Mike Arrington's verification model for this source? Why a FriendFeed post from Jason Calacanis of course! Mike Arrington has confirmation that the two companies were talking but no acquisition confirmation.
Hat tip to Josh Chandler for breaking the news.