One of the best ways I have found to use Twitter is as part of the Social Marketing & Reputation Management Consulting Services I deliver to dealers... Specifically, I use the RSS Feed application available at http://rss2twitter.com/feeds
to set up automated Twitter updates for the dealership's followers from their online community's Latest Activities RSS, the Blog RSS, the Forum RSS, the Video RSS, the Photo RSS, the Events RSS, etc. One of my next projects is to tie a used car special web page to an RSS that flows into the dealership's Twitter updates... But, just for VERY special vehicles at VERY special pricing... I believe the key will be exclusivity, maybe one or 2 Used Vehicles listed in this section and feed to Twitter each day. I would like to hear from other ADM members about ways they have found Twitter to be useful.