The days of waiting until you get home to purchase items from the PlayStation Store are over. Sony has finally launched its browser-based Sony Entertainment Network store, letting you pick up games and add them to your list of purchases from anywhere.
Purchasing content on the store front will add it to your "My Downloads" column in the PlayStation Store interface, so you can download it for PlayStation 3 or Vita at your leisure. It doesn't auto-download, but at least this way you won't miss a sale price by being away from your system. You can also purchase entertainment content like movies or TV episodes and watch them on your PC, or Xperia devices. The store has recently added PayPal functionality to wallet funds as well.