VLC Media Player
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Full user review
"A media powerhouse....Just Don't judge it by looks."
The default interface for the player is not the best...But is usable makes up for it. It supports near every codec known on the internet and will likely replace any other media player you have on your computer.
If you would like to replace Quicktime, a DVD program and Windows Media-player with one simple program that does it all...Look no further.
As an added bonus.....this thing even plays DVDs.
The default skin screams Windows 95. But its simple and it works.
If it really annoys you however, you can download more skins on the internet.