Yes you can play PSN (playstation network) for free.
Yes, Killzone 3, like all PlayStation 3 games, has free online gaming. It operates on PlayStation Network, which is free for all PlayStation users. The only PlayStation 3 games that do not provide free online services are MMOs (massively-multiplayer online role-playing games).
There are no PlayStation 3 covers specifically designed and produced by Sony. There is however, an enourmous online market for specialty and custom covers. A quick online search for PlayStation 3 covers should have you playing with style in no time.
If the PlayStation 3 being used has reverse compatibility it can play PS2 games online with PlayStation 2 players.
Nope, its only the PlayStation 3 games that you can play online with your PlayStation 3.
No The PS3 Dual Shock 3 controller is not designed for the PC
No for a number of reason one is that the PS3 plays on the PlayStation Network and the PC can not use that network. Another is that the PC must play a PC version of the game and the PS3 plays the PS3 version of the game. That means they are not playing the same game.
No it can not
playstation 3 is best because if you want to get online it is free
The related link from the Playstation Knowledge describesHow do I connect the PlayStation 3 computer entertainment system to the Internet?
No it is not. RuneScape is an online role-playing game that offers both pay-to-play and free-to-play options.
The PlayStation 3 offers free online play on the PlayStation Network. It won't cost you a penny, all you need is a PlayStation 3 game console.