From the Noob perspective, in my first few posts (and probably many in the future) I spent a long time going between the FAQ docs and the preview pane. I think there would be value in a 'sandbox' area where Noobs like me can play around with the formatting. The top page should be an example of a 'good post' to which anyone can post replies (trying to emulate the formatting). The reply part is key, IMHO, since just creating a post is easy. Making a post that fits within the accepted style parameters and flows with the replied-to msg is the hard part. If sandbox clutter is a problem, maybe the replies could be autopruned in 12 or 24 hours.
<sigh> I'll be really embarrassed if I missed the existing sandbox.
Oh, and since I haven't said it yet... Very cool site, content and community! (Yea, that's right... I'm gunnin' fer paco and I'm not above suckin' up ta get 'im!)