Slipstream is in! (that must just kill the Paceline folks given that it's now confirmed Astana is out). Other wild cards to Agritubel and Barloworld like last year, otherwise the 17 additional Pro-Tour teams are in.
http://www.cyclingnews.com/news.php?id=news/2008/mar08/mar21news
http://www.cyclingnews.com/news.php?id=news/2008/mar08/mar21news