Technorati tracks 3 million blogs
"We're seeing over 275,000 individual posts every day. That means that on average, more than 3 blogs are updated every second. The median time from when someone posts something to their weblog to when it is indexed and available for searches on Technorati is 7 minutes. And we're striving to handle the load. But to be perfectly frank, it isn't easy."
IMHO This service really rocks. Tecnocrato has received some flak but just like Christopher Carfi I think these guys should be given a loud round of applause.