... or mouse, if the jukebox software can use mouse wheel to tone volume up/down and right or mid button to skip the song. That is what I would do in MultiFE (which these buttons can been show with pincode protected). I guess it not hard for example for Freebox to support the wheel for volume (haven't tested if it allready exists). Otherwise it would been a nice feature to do that.
Windows Media Player remotes is normally just send some keypresses.. and is useable for jukebox application. If Windows Media Center is not used, remember to disable some service, so the big green buttons dosen't start that, if that application is not used (not checked these out).
A remote controller I would recommered, but still not having that is StreamZap.
UncleT use a Logitech one if remember correctly for his jukebox (using his own software of course), but which one it was?