Looks like another follow the leader situation. Businessweek reported on Saturday about Yahoo annoucing a new blog search to come shortly. The search may be "cover only one aspect of blog or RSS search, and not the comprehensive release the search industry's waiting for." according to the article. I do hope it goes one for one with Google's blog search they released last month.
Could not find forum discussion on this, but check out Battellemedia or SEL for more discussion.