NoSoup's Guide to Obtaining and Maintaining Excellent Credit
This is the first thread that comes to mind. Credit is something that doesn't catch one's attention in the rush of life, the 24/7 news cycle, and the flood of media all the time. Knowing about it can save one thousands and improve one's life (insurers use it now also). Solid advice. Good questions. It's already helped my life.
No Soup's and The_Jazz's other financial discussions are great also.