Last week we had a major Google update named the Jagger Update. That update increased and decreased many site's pagerank including http://blogsearch.google.com/.
The question raised in Search Engine Watch forums by Sharon and Roy was, why did Google's BlogSearch page jump from a PR0 to a PR9 in a matter of days? Sharon and Roy say that "Google blog search engine debuted on September 14, 2005" and then they list out a historical record of backlink tracking for that site by Google, Yahoo & MSN.
Forum discussion at Search Engine Watch Forums.
