Someone should make a timeline(s) where......
The NFL-AFL merger never happens, or the NFL folds into the AFL.
After the Jet win in SB III, I heard something about how the AFL didn't want to merge after all, and keep the leagues separate. However, Paul Brown, the Bengal owner, wouldn't hear of it. When he was awarded the Bengals, he wanted an NFL team, and he only took the AFL team because of the merger. If they didn't want to merge, Paul Brown would have filed a lawsuit. What might have to happen is that, to keep the leagues separate, maybe Brown trades teams with Art Modell and gets back in Cleveland.
Tom Brady stays healthy throughout 2008.
The Pats win the East with a 12-4 record, but lose at Pittsburgh in the AFC Championship game. Cassel never starts, and Cutler and McDaniels aren't having their current feud in Denver over Cutler trade rumors. Stay tuned to this story.
Scott Norwood's last minute field goal wins Super Bowl XXV for the Bills.
The Bills still go to the SB in 91, but lose to the Redskins in a much-closer game. Then, in 92 and 93, the Oilers end up representing the AFC. They beat Dallas in 92, and lose to them the next year. Buffalo uses these playoff failures as impetus to improve their team on defense and the line of scrimmage, make it back to the SB in 95, and beat the Cowboys. The Oilers end up not leaving Houston, and Warren Moon retires an Oiler in 97 or 98 with Daunte Culpepper or Jake Plummer as his successor.
Eli Manning bows to pressure and the Patriots hang on to win Super Bowl XLII.
People would be referring to the undefeated 07 Pats as the best of all-time(although I wouldn't have agreed with that).
Michael Vick finishes his career at Virginia Tech.

In the 01 Draft, the Chargers still take Tomlinson #1 overall. The Falcons take Richard Seymour with their #5 pick, and, still needing a QB, trade up with the Broncos. They get the #24th pick in round 1, and the Broncos get their second and third rounder. The Falcons take Brees with the 24th overall pick. The next year, the Texans take Michael Vick first overall, the Lions take David Carr third overall, and the Chargers take Joey Harrington #1.
Here are some other WI's?
1. What if the St. Louis Blues move to Saskatoon in 1983? They came close in OTL.
2. What if the New Jersey Devils got Mario Lemieux #1 overall in 1984 instead of the Penguins?
3. What if Archie Manning was traded to the Packers in 1974 in lieu of the ill-fated Hadl trade(that almost happened, but Archie's backup got hurt).
4. What if the Bulls won the coin flip in 1979 instead of the Jazz(who had to give their #1 overall to the Lakers for an earlier trade) and took Magic Johnson?