A few problems I've noticed with the classified section
It requires a price in US money. A bit of a problem if someone in the UK or elsewhere wants to sell something, although you can explain things in the text of the post.
It only lets you set one postal price - again, a bit of a problem if you're selling globally
And (the big one for me); mostly what I've posted there has been links to eBay UK auctions for the things I'm selling - I've just had to delete my last ad because all of the links had vanished.
If this is to be useful I think it needs a bit of a rethink.