Rockbox

[cruisaire]

If you haven't ever checked it out, take a look at rockbox (open firmware). I use it on a Sansa e280 and the features are pretty cool. It's free too!

 

[jeff94]

I just installed it on my 4th Gen iPod at work earlier today. Pretty fun to mess around with so far.

Interestingly, I installed it before seeing this thread. Weird coincidence...