While I was typing, evilg123 replied... Â I'll post most of what I was going to post. Â First of all, evilg is right, you cannot yet use rockbox on the 80 GB ipod. Â You might want to watch the patch though and wait until it can mount the filesystem. Â To use a patch, you will need to learn how to compile. Â I reccomend reading the VMWare Development Platform page on the wiki (
http://www.rockbox.org/twiki/bin/view/Main/VMwareDevelopmentPlatform ), and setting up a Development platform if you're up to it.
Although, I must say that something like this is not for the computer-illiterate. Â If you don't know much about computers, then perhaps someone here can compile rockbox for you, or you can just be patient and wait till the patch gets into SVN.
Contrary to what evilg says, I'm pretty sure that it is completely possible to permanently damage (see Brick) your ipod while installing rockbox if you do not do it correctly. Â Read the manual and follow every step percicely.
Note: I'm still learning... please let me know if I have anything wrong here...