if you phone sony they have a replacement service for broken ones, its free if your in warranty and £120 out of warranty.
its like for like though so if you have a 40gb fat one thats what you get, they are also re-conditioned ones not brand new although most of the components are new or replaced.
i have had 2 replacement ones, first one lasted about 2 years then overheated second one still working so far 1 and half years an i keep it in a better ventilated area.
they send it out by courier, its fast and all you do is take the new ps3 and give your old one to the courier, only the ps3 not wires or accessories.
oh and its a 3 month warranty! shld be at least a year in my opinion!!!
cheers jebus