Salads as a Nutrition Source

I think salads made with dark, leafy greens (ex. Romaine lettuce) offer such a high level of important nutrients and fiber that it's okay to add a wee bit of what you like in it so you will eat it more often. Though I would be cautious of Caesar salads. Have the dressing and parmesan on the side so you can control the amount you consume. Three cheers for greens!

You should avoid cheese and bacon bits and croutons and dressing and ham and eggs, etc.

I have heard conflicting opinions on the nutrition value of most salads. I know that a low cal dressing is key, but what else should be avoided?