This article from Wired discusses "credit hacking," techniques to obtain a lot of low-interest credit or to remove the hard inquiries from one's credit report. An interesting concept, but I wouldn't recommend trying it yourself.
Jeff Michael: Repair Your Credit and Knock Out Your Debt
I highly recommend this book because I wrote it.
Edie Milligan: Tips from the Top: Targeted Advice from America's Top Money Minds
I have about a dozen entries in this book.