You can check out the page on the Wiki here. It's been around for a while but it's never really taken off, which makes me sad.
As for the 'more examples of stories', there's always the Other Prominent Agents tab on the Wiki as well.
Honestly, I think the reason why people don't explain much to newcomers in the PPC is because, well, newbies tend to not stick around. Confession time: I have a welcome speech that I copy and paste (and sometimes slightly alter depending on what the newcomer says they've already read). Going to the trouble of writing out a creative hello just gets discouraging when a newbie vanishes into the internet, never to be seen again. And if a newbie has questions, well, that's what the Wiki is for.
As a newbie myself, I feel that I have really been welcomed with open arms onto this wonderful community. Seriously, you guys are awesome. But, we need to explain a few more things on arrival. I know ... more