A Jailbreak let you access the file system and install mod's/Apps people made free. I only plan on if i find a good jailbreak that works to modify a plist(config) file to allow Multitasking. It will run on older ones i'm told but not great so Apple disabled it for older devices. I won't use it for cracked Apps or anything but just to turn on multitasking and Wallpaper. I heard Mix things about it being illegal and legal. I don't really want to buy a new iPod till my old one dies.
I also know it voids the warranty but its not under a warranty anymore.
I also know it voids the warranty but its not under a warranty anymore.