It's also useful for backing up files and photographs, in case you loose them from your main PC
I learnt that the hard way...
But I use an external hard drive, they can be cheap, all you need is a 40GB one or even less for just transferring files and it also comes in handy for other things.
A priceless solution is dropbox, on both old and new computers download it and connect them, extremely simple to do, on your old computer simply drag and drop the files in and they will appear on your other computer, then just copy them out of there. On the free one you only get 2GB of space though unless you pay for more