Yea, you can get ones and set the buttons for your keyboard, so as they dont interfere with typing. you could use the f1-f12 to control things like play, stop, and pause. another more complex thing you could do if you want to mount the winamp controls on the front of the computer beside the lcd screen is find an old keyboard and take the controler out and remember which letter keys corespond to which wires and put a momentary switch instead of keys. then you could have say 4 momentary switches that corespond to keys g,e,y,c which you could tell the winamp plugin to use as play stop, next track, and pause. here is a link to a page with the schematics and a little more elaborate instructions
http://mp3car.com/usersites/arby/buttons.html