There is currently a hack over at SourceForge that is looking pretty good, and it gets stats, players, schedules etc. from NFL.com, because they have "a nice structured system of page creation. URLs are predictably encoded (such as nfl.com/rosters/team or nfl.com/gamecenter/live/nfl_date_away@home) and the presence of player profile links provides for definitive identification when correlating stats." I don't think they have permission to use NFL.com's stuff. Is that a problem?
Oh btw, heres the link to the SourceForge project:
OFFL