My plugin for real estate, Great Real Estate, has been released and is now available for download at WordPress.org Extend / Plugin Directory:
This first version contains a lot of features, but can be configured fairly simply from the start. The main premise of this first version is to display an agent's own listings in a nice format, without custom html. But it also integrates a photo gallery (from NextGen Gallery), videos (from wordTube), panoramas (from FPP-Pano), Google maps, downloads, and RSS feeds to sites such as Google Base, Trulia, Zillow, and My Yahoo!.
I'm working on detailed user documentation, and that will be added to the Great Real Estate plugin homepage in the coming few days.
Hopefully this will be helpful to the folks who have been looking for a WordPress plugin to easily display their listings.
I'd love to hear your feature requests and feedback!