List of trans fat free oil chain restaurants.

This is my list in progress of trans fat free oil chain restaurants:

Cheesecake Factory: article
Chili's: article
Fatburger: article
Jason's Deli: article
Longhorn Steakhouse: article
McDonald's: article (phasing in now)
Panera Bread: article
Ruby Tuesday: article
Souper Salad: article
Starbucks: article (not done yet in some cities)
Taco Bell: article
Wendy's: article (some controversy on this)

Arby's (by May 2007) reports having fries that fall below the US FDA reporting standards for trans fat.
KFC (by April 2007): article
Olive Garden (by Nov 2007): article
Red Lobster (by Nov 2007): article

As always, you should verify yourself.