Currently you display a lot of info that is not needed in the main forum.ie thread starter, # replies, #views, rating, & last post. This info could be viewed inside the thead. The reason I say this is that if you did away with this you could then split the screen and have the For Sale Thread headers on left and WTB on right. This way WTB is viewed more easly.
Also you may consider writing a program that matches For Sale items with WTB. (example)Let's say I have a futaba 4 channel radio for sale your progam could let me know that joeflyer is wating one, and the program could notify joeflyer by email that i have posted for sale.

Just a thought from a newbe