I think it would be awesome if the mp3 player could also play wma's. I have hundreds of wma's on my hard drive but no mp3's. Using winamp with soldat can be annoying. If I want to change a song I have to use the alt + tab function then change whatever in winamp then hit alt + tab again click a couple times for the soldat controls to activate. That all takes time.

Or invest in a keyboard with the play/stop/prev/nxt buttons

Awesome suggestion:

Open up windows media player or whatever plays wmas. Then open Soldat. Whenever you want to access the music player, hold down <alt> and tap <tab>. A temporary solution to your wma playing woes atleast.

or convert your wmas to mp3s
im sure a quick google search would show you a suitable program

@shoes: what about people who play in fullscreen and whose current servers have so much activity that running something like WMP lags the game?

Winamp doesn't cause lag, run Winamp and set up your music to your liking.
Then you won't have to switch anything.
Or like livingdalife said, if you have it. ;]