Title says it all. I'l start.
Wrestlemania X-8
Undisputed Title
Chris Jericho vs Triple H
Stone Cold Steve Austin vs Hulk Hogan
The Rock vs DDP (Peoples Champion vs Peoples Champion)
The Undertaker & Kane vs Kevin Nash & Scott Hall
Kurt Angle w/Vince McMahon vs Mr Perfect w/Ric Flair - If Angle wins, Vince takes over WWE. If Perfect wins, Flair takes over WWE
Womens Championship
Trish Stratus vs Lita
Intercontinental Championship, first ever singles TLC Match
Edge vs Christian
Tag Team Championship
The Hardy Boyz vs The Dudley Boyz
Booker T vs Rob Van Dam
Hardcore Championship
Raven vs Tommy Dreamer
European Championship
William Regal vs Goldust
I will do a bit more of an adventurous one now, in a way that some of the people I will mention here weren't in the company at the time but they were in the company in or around that time:
Wrestlemania IX
WWF Championship
Bret Hart vs British Bulldog
Tag Team Championships
Hulk Hogan & Ultimate Warrior vs Money Inc
Loser Leaves Town Match
Ric Flair vs Mr Perfect
Intercontinental Title
Shawn Michaels vs Randy Savage
Yokozuna vs The Undertaker
Doink The Clown vs Crush
Razor Ramon vs Lex Luger
Tatanka & The Steiner Brothers vs Bam Bam Bigelow & The Headshrinkers