iPod Nano Latest Firmware Page and Download???

I would like to know where apple has their Ipod Nano (2nd Gen) firmware page so that I can keep up to date on the firmwares. I do NOT want to install iTunes under any circumstances as I do not use it, and don't ever plan on using it. I'm sticking with winamp for all of my transfering as it's much more intuitive and a much smaller foot print (i.e. more efficient code and no windows services installed like on iTunes).

Thanks