Craiglist is confusing to use.  Not only is it hard to figure out where you should look for an item for sale and where to post an item for sale, it's also hard to keep track of your posts.  

This proposed design update makes use of the most used features of Craigslist - buying and selling.  The first page design showcases the landing page which allows you to quickly select your region and what type of item you are selling or buying.

The second page expands upon the item categories and allows you to select the specific type of item(s) you are selling, add a title and description, and upload photos all on one page.

The navigation allows you to quickly browse categories (virtual window shopping), review your browsing history, review your active posts, and review any posts that you are following.