Sony today released the long awaited SEN (Sony Entertainment Network) Web Store which is basically a web based Playstation Store. Currently the store is only available in PAL (European) regions but is expected to arrive in other regions soon, also some browser like Opera are not supported.
The SEN web store greatly resembles the recently updated Playstation Store, and will allow you to purchase games and content directly via your browser. You can later download your purchased content onto your devices.
Click over here to browser the SEN yourself.