Shopping on PS3? Yes, with PlayStation Store you can. Simply get your console online and you'll be able to indulge in some retail therapy from the comfort of your own pants. Games, demos, trailers and extra content can all be downloaded straight to your PS3 (expect to add music and movies to that list in the future).
Like any high street shop, you have to purchase goods from PlayStation Store with real money. To make things super easy - and unlike Microsoft and Nintendo - Sony has opted to represent money in PlayStation Store as money, not points. So, you'll know exactly how much stuff costs and how much you're spending without needing to juggle numbers in your brain. Hurrah.