My PS3 broke down outside of warranty, but by New Zealand law, the Consumer Guarantees Act says that goods should last for a "reasonable" amount of time. I didn't think 21 months was reasonable for a PS3 and since Sony refused to pay for the repair, I took them to court and won.
What won it for me is the Consumer article, which said that computers should last for 5 years and DVD players for 8+ years, both PS3 functions.
They tried to argue that the PS3 wasn't classified as a computer, however there is no reason to suppose that PS3s are any less durable since they are used for games and receive hard treatment from children.
So the Disputes Tribunal ruled that my PS3 was not of acceptable quality and ordered Sony to reimburse me the repair cost.
Anyone is more than welcome to use this case as an example if they have a similar dispute. The case number is CIV-2009-094-000642. Take 3 print outs of the Consumer article.
It cost me $30 to have the hearing and all information you need is on the Disputes Tribunal website. Note that you will need the name and address of the legal entity you're taking to court, which can be found at the Companies Office. You can either take Sony or the company you purchased the thing from. I recommend the latter because it's just easier. The Sony offices are in Australia and they don't have a clue about NZ law.
Note that warranties aren't very important in New Zealand. People selling extended warranties are basically criminal, because we're already covered. See the Consumer article about this.