Like he said, few inches away, phase reverse (don't be afraid to move them around if they cancel each other out and sound odd) - but I'd use a 57 or i5. I'll try to find some good clips, but I may not find any really good examples.
There was also a discussion earlier about how to utilize both of them well that wound up containing some settings and ideal time placement for the most 'natural' sound, I'm not sure where it went though.
Jeff