Real Clear Politics has a breakdown of every Senate race this election cycle. Republican and Democrat Senate seats are placed into different catgories based on the chances for victory in the November election. Real Clear Politics also has polling data for most races for Senate and Governor. High profile news articles are another source of information on the site.
To visit the Real Clear Politics Senate map, please click here:
http://www.realclearpolitics.com/epolls/2010/senate/2010_elections_senate_map.html
Jim Sutliff