Looking for the Default Blog Search Engine

"The race is on to become the Google of blogs."  Well, no surprises here and I'd suspect that most people reading this blog would agree.  Nevertheless, I thought I'd share since the WSJ.com has kindly aggregated some blog search engines in a recent article written by Vauhini Vara entitled "New Search Engines Help Users Find Blogs".  Although no real winners emerge in the article, Vara does a decent job of describing some of the subtle content differences of the listed providers including Technorati, IceRocket, Feedster, Daypop and Bloglines.  The article also offers a nice visual to illustrate what sets the engines apart.  I'm not going to bash the article but I was extremely surprised not to see PubSub mentioned in the piece.  PubSub is doing some innovative things around matching and prospective search.

Basically from what I know Google, Yahoo, MSN, Technorati, BlogPulse, IceRocket, etc. are all retrospective search tools, meaning they take your query and answer it with historical information - what's already out there.  PubSub is a prospective matching engine, meaning it's only concerned with information you want to be alerted to from this very moment forward.  I'm by no means the expert here just really fascinated with what PubSub is doing. 

Since most of the new search engines are less than a year old, it will be interesting to watch how all this plays out.