Technorati is the recognized authority on what's happening on the World Live Web, right now. The Live Web is the dynamic and always-updating portion of the Web. We search, surface, and organize blogs and the other forms of independent, user-generated content (photos, videos, voting, etc.)

The World Live Web is incredibly active, and according to Technorati data, there are over 175,000 new blogs (that’s just blogs) every day. Bloggers update their blogs regularly to the tune of over 1.6 million posts per day, or over 18 updates a second.

http://technorati.com/