I'm linking people here because I feel it's the most accurate list that's been posted yet, on top of the fact that it's probably the most educated:
http://www.smashboards.com/showthread.php?t=192222
For those who are too lazy to read it, this is M2k's tier list (copied and pasted):
Top
Sheik
Fox
Marth
Falco
High
C.Falcon/Jiggs/Peach (I cannot decide an order, so I'll just rank them the same, even though it's probably Falcon Jiggs Peach)
Ice Climbers
Dr. Mario (he is better than Mario for winning purposes, and he is very underused and underrated)
Mid
DK/Ganon
Mario
Samus (she's very limited, I know high level Samus and she's definitely very limited and not very good outside of a few tricks at high level and her broken wavedash back)
Luigi
Pikachu
Link
Low
Y. Link
Zelda
Roy
G&W
Yoshi
Bottom
Mewtwo (taj convinced me, and after thinking it over I agree)
Pichu (up throw is the main reason esp vs fast fallers, and Nair -> Nair combos)
Bowser
Ness
If you want MUCH more detail into the tier placements, check out that link. Now my only problem is: how is Samus so low? The only thing that I can see potentially changing from this list is moving Doc to the top of Mid tier, and moving Samus into his place. Apparently, Samus at top level play isn't as good as I thought, but something still doesn't seem right about her placement being so low, and tournament results can back that.
One other thing, IMO DK > Ganon. The more I play DK and test out his matchups the more versatile I see he is. His combo tools and edgeguarding capabilities are beast, plus that chaingrab on spacies is absolutely lethal. He's my new secondary for Captain Falcon (^.^)