Nice.

Some of the older iPods won't work with the 310 or 510. It looks like you have the correct lead as it wouldn't fit the iPod otherwise. Not sure exactly which model iPods work and which don't just that some old ones don't.
You should get one iPod cable (only fits iPods) and one USB for Walkmans or memory sticks.
If you are trying to connect an iPod via a USB to the supplied USB cable that won't work either, you need the specifc iPod cable.(plugs straight into the iPod).