I find it hard as hell to come up with any real edge in pro football...there's only 30 teams and pretty much everybody watches football so the lines seem ridiculously sharp. IMO the only way to bet in football is either teasers or totals... teasers can be very succesful if you find teams that lose but are always competitive (think of the lions or redskins from last year) or matchups that are always very competitive (ravens steelers, patriots colts)
I just wish college football was around every single day, this is far and away my favorite sport to bet on