LeeAnn Prescott, over at Hitwise, posts about blogsearch market share - the takeaway is that Google's blog search is beating Technorati.
Readers of this blog may recall a post I made back in October, on the 23rd, which delivered similar information. The graph below, which I've copied from that post, shows just the same jump in traffic from Google's blog search as the Hitwise graph above. It is important to note the differences. I was looking at actions taken as a result of searching - looking at how people arrived at a blog. I believe the Hitwise data looks at visitors to the search sites. Search is only one thing that can be performed on Technorati. To make an extreme example, if Technorati's blog was hugely popular and no-one was using Technorati for search, Hitwise's results wouldn't show this (at least, that is how I interpret their description of the data using the 'www.technorati.com' label).
The Hitwise post has some further interesting details regarding the demographic breakdown of users.
Discussion over at Niall's blog revolves around Technorati's reliability issues driving people to use Google's solution. Interestingly, this comment over on Search Engine Land claims the same problems for Google's blogsearch.
With all the talk of late regarding the reliability of visitor/impression data and how things have to change, I'm disappointed to see that there is no fact checking of the original Hitwise post - every post I've seen thus far on the topic just quotes LeeAnn with no discussion other than to guess as to the reason for the changes in traffic.