I am pleased to release my realestate project based on drupal "Drupal Estate." it is using rlisting module and i have done various customization with views etc. it is based on drupal 5.x . you can download the code here:

https://sourceforge.net/projects/drupalestate/ 

I am looking for some one to help me with site design for this project, also if anyone is willing to further develop it please contact me.

you can see it in action here: http://rentsellmyhouse.com

Thanks,
-Hardik Shah