I just found out about this from a Google ad on Gmail, it seems the giant is taking the blogging information seriously. Pretty much the same as for regular searches however for faster indexing on results you can automatically send pings to their Blogsearch Pinging service.

More information on Pinging at http://www.google.com/support/faqs/bin/static.py?page=faq_blog_search.html&hl=en.
More information on Blogsearch at http://www.google.com/support/faqs/bin/static.py?page=faq_blog_search.html&hl=en