There's also some changes on the way.... impacts SERPs and Search Engine marketing. Check here for more details:
http://blogs.zdnet.com/micro-markets/?p=1362 and here:
http://blogs.zdnet.com/micro-markets/?p=1363
1) Google top ten organic SERP result set is gone,
2) Google pits Web pages against other content in a perpetual SERP smackdown.