[url]http://www.developmag.com/news/30726/Sony-relaxes-approvals-process[/url]
Posted this up in the shoutbox on the main site, but I thought I'd crosspost here anyway, particuarily as Zippy might be interested.
In short, you no longer have to get Sony to approve your game's concept in Europe if you're developing for PS2- while this does not affect the US or Japan, nor does it make mention of having to keep to Sony's technical guidelines, it does seem to mean that you can get away with anything on the platform, allowing for ratings boards and other commercial pressures.