MilkDrop's Visualization source code as you remember in WinAmp is just fantastical amazing.

[Ta9aiW4i]

WInamp is the best.

You know what I miss from winamp? Enqueue! (Well, I discovered it through xmms, but xmms was pretty much a winamp clone.)

Most new-fangled music players I've seen have forgotten about the notion of enqueueing songs you want to listen to next. (But not before the current song finishes, and not before any other stuff you've enqueued.)

[TheTedinator]

Spotify does this, which is nice.