If you are looking into PS3 development, you most likely heard of scedev.net. Scedev is the developer plattform by Sony which gives approved and licensed developer access to SDK downloads, Updates and Documentation. A lot of people would really kill for access to this, but tbh, most of the content which is available via scedev leaked anyways and it is not that great for PS3 hacking than you might think. The really important parts of the hardware documentation are not even given to licensed developers since they are usally not really needed. You will have much more gain from reading the IBM CELL SDK docs, especially the EXTRA ones from the second disc (Security SDK) than from anything you find in here.

If you are just interested in how it looks like from the inside, than you might want to google for the leaked scedev src which was published by a group called lulzsec a while ago. It at least gives you a bit of inside view of something you most likely will hardly see from the inside. For everyone else it got even harder firewalled now. No luck, sorry.