Forums with quality discourse
robk: I really enjoy flyertalk.com for travel and frequent flyer discussions.  Their subdomains for particular programs are ripe with really detailed info how to maximize value from any miles you accumulate (even if you earn the miles through methods other than flying).  This was the home of Pudding Guy, the miles hacker who collected yogurt tops and earned something like 10 million frequent flyer miles for < $2,000.  That's a lot of free flying.