i got me a maxtor 120gb onetouch usb2 jobber. got about 30gb of music sitting its belly at the moment, along with other things
i also have a dvd writer linked up to an external case which just has a usb to ide thingy in it. this cost me about £20 from blankdiscshop i think, that can hold hard drives too.
go for it, makes life trÃÃâ€*’©s easy