Hi. I added a case study so please forgive me if it's not ok to add a post here about too. Betcars.com is an auction site for used cars. It has "ebay-like" autobid capabilities too. Many community modules have been used to reach our needs.
If you want more detailed info please refer to http://drupal.org/node/1833724
I would love to read some opinions about the site and also answer questions if some of you have any :)
This is the url, btw http://www.betcars.com
Thanks for yr time.