While I'm at it, I might as well show this one as well.
This site has been a thorn in my side for a few months. I am generating a post for each listing and using the theme on a WPMU set up.
I currently have about 37,000 listings on the site and it gets refreshed nightly with any new listings for each county as well as turning any listings that are no longer on the North Texas MLS to a private post. (This was by far the most difficult part of creating the site)
I still need to get a bunch of content on the site for each of the counties to help with the SEO aspects, but it is already generating good results and getting a few leads per week.
There is still a bunch of work to do but let me know what you think of it so far!