You can pretty much ask restaurants to put any sauce, dressing, etc. on the side so that you can control how much you eat. You also have control over the way the food is prepared (i.e. fried, grilled). Also, I find that most restaurants serve HUGE portions of foods. I usually eat half of it, and ask for a "doggy bag" to take the rest of it home. I eat the rest of my meal for lunch the next day.
There was a book out not too long ago about why French women don't get fat ( I forget the title). The main thesis of the book was that French women eat whatever they want, but that they watch their portion sizes, which prevents them from getting fat. I find it interesting, because when I enter my food into a food diary (i.e. fitday)I find that I can eat a little bit of just about anything, and it will not significantly effect my caloric or fat intake. For example, I like chocolate. I find that I can eat a few squares of it (but not a whole bar) without ruining my day.