Here's what Marylaine Block at Neat New Stuff has to say about this great site for opinion information:
"A statistical heaven for political junkies, with charts, tables, and maps
showing the ever-changing preferences of voters as the 2008 presidential
election approaches. Also check out the Pollster blog, whose blogroll
includes poll links to public pollsters, academic surveys, survey
research organizations, and other poll blogs and sites."