Do some reading around here, and if you have the scratch, consider picking up a copy of the New Stereo Soundbook. It's a bit pricy, but a very good education on stereo sound concepts and techniques.
You've come to the right place though. I've seen a LOT of people running a pair of expensive mics (sometimes incredibly so) side by side with no included angle at all. Unless they want a mono recording and run a second mic as a backup to the first, then I just don't know what they're doing. Or, should I say, they don't know what they're doing.
- Jason