If you load the latest firmware, 5.31-298, you can name the sources so that instead of saying just Net 1, Net 2, Aux 1 and Aux 2 you could have CD Changer, iPod, DVD Player, Playstation or whatever is appropriate.

The name of an iPod source (you could have 2 iPods, as I do) can be set so that it is automatically set to the name of the iPod, plug in a friends iPod (without ABBA on! ) and the name of that iPod will appear as a source.