Multimedia 4: Player & Codecs

MediaMonkey
The Most Valueable Audio Player with an excellent Database and powerful managemant features. Worth to buy, 2 Thumbs up!
MediaMonkey (free or gold available)

Winamp

Video Lan Client

K-lite mega codec Pack [includes ffdshow]

ffdshow

Lame mp3 Codec

QuickTime Alternative

Real Alternative

Media Player Classic