Old Patch Upate Notes?

Hi everyone, new member here.  I have a 2GB Clip that I’ve had for about a year and a half now (my second, my first was stolen three weeks after I bought it), and I just recently thought about looking into firmware upgrades.  I’m actually a little surprised that there are some, seems like most companies fire and forget their products these days!  ^_^;;

Anyway, I was hoping there might be a list of firmwares and/or easy links to the patch notes somewhere.  I couldn’t seem to find one, would anyone here know where I could find such information?  I’m curious to see everything of what would change if I install it, instead of what’s new in the latest version.

(Currently using V01.01.18A, to give an idea of how far back I’d like to go.)