Thanks! Bitcoin Classifieds is nice but it could be better. The issue is still security, and indirectly related convenience. Bitcoin Classifieds is basically Craigslist; on the security point, unless you do the transaction physically, there is no direct form of security. And on the convenience side, to have that security you have to go to a third party escrow.
For example:
If there was say, "Amazon like site", where you can set up e-shops and sell products through the site. People deposit Bitcoins into the site, similar to an exchange and they use that credit to buy things that people are selling. This gives effectively just as much security as Ebay or Amazon does, although you still have to have trust in the website. It could be free to deposit and withdraw Bitcoins from the site and just charge maybe "X"% or a flat rate for when a purchase is done just for the security. For example, I can say for most people trust large, easy to use exchanges rather than attempting to sell Bitcoins individually. If you don't it at least should be an option just how Craigslist is an alternative option to Amazon and Ebay.
Some requirements:
-It is easy to navigate, i.e., good categories (looks nice also)
-Escrow similar protection integrated, i.e., depositing money before being able to buy, seller review system
-Well advertised
-Developers would have to be reliable members of the community