Mark Van Alst from Evident in The Netherlands have made a very nice site over the Christmas holidays which utilizes Google custom search to index over 30 Sitecore related blogs.
Check it out here: http://www.sitecoreblogsearch.com/
Original post by Mark: http://www.markvanaalst.com/2008/12/26/custom-search-for-sitecore-blogs/
Well done!
