The first decent red-vs-blue corporate consumer guide that I've found online is at buyblue.org.

Let's say, for example, yer thinking about subscribing to a DVD-by-mail service. You have Netflix and Blockbuster, right? I've heard that Blockbuster is a bit cheaper. According to buyblue, however, Netflix employees give approximately 72% of their political donations to Dem or left-of-center causes. Blockbuster, on the other hand: 40%. Go with Netflix.

Not a bad little shorthand method.