Winamp 1.55 is one of the last versions to use the playlist where each function has a seperate button, allowing for easy keyboard-only use (like us TRUE oldversion oldskoolers do it!.
1.55 also only uses ID3V1 tags and is not bloated with minibrowsers and plugins for ULT, S3M, and other formats which (though they totally rock) are hardly ever used for anything.
WinAmp 1.55 forever!!!!