ALL:

Part 1:
     Updated list of X-Teams.
     Updated list of starting points for back issue collections.
     Updated definition of mutant.

Part 2:
     Typo patrol.

Part 3:
     Updated list of X-Men.
     Updated classes at Xavier's.
     Updated Professor X's legs.
     Updated gay X-Men.
     Updated Rogue/Gambit sex.
     Updated Mystique family tree.

Part 5:
     Updated whatever happened to everyone.

Part 6:
     Updated Magneto's existence.
     Updated Hellfire Club members list.
     Updated Wolverine's origin.

Part 7:
     Added secondary mutation / appearance change question.

Part 8:
     Updated _X-Men_ cameos.
     Added _X-Men 2_ information.
     Updated credits.