I found a pretty good post about how
many CC's and how often and figured I'd list it here for reference in case anyone else comes here with the same question.

Frugal Travel Guy has a good description of his churning method on his posts on 12/14/09 and 12/15/09. He tries to do 6 a quarter, of those, 2 from each credit agency (experian, equifax, transunion) so as to not bump inquiries too high. Credit agency is checked by state on credit
pull db over at creditboards.