Anyhow ....Some people have a dedicated dock/speaker unit ....
Instead of a HI-FI system to playback their entire collection when they are at home as its a convenient way of having 80gb or more of music in one handy package or some use it in the kitchen or bathroom
same as some people buy the FM adapter to connect their IPOD to their car stereo and play their music in the car!
whats so odd about that?!
to answer the question AS ABOVE connect it to your PC and playback using ITUNES or WMP etc (connect as a removable device)