I've done some coding that allows you to now enter a prefix before your thread in the Classifieds, such as FOR SALE, FOR RENT, FREE, etc. You'll see it when you create a new thread in any of the Classifeds forums.
Also, I've created functionality for you to mark your items as SOLD and have the thread automatically close when you sell it. If the buyer backs out, you can even mark it as UNSOLD and the thread will reopen.
More info and instructions can be found in the FAQ section under "Posting in the Classifieds":
http://www.saltycajun.com/forum/faq.php