I have always put tomatoes in the fridge, I just assumed that you were supposed to.  Here is what I have just learned.

There are a few foods that should not be kept in the refrigerator:
Tomatoes lose flavor when chilled below 50 F because an important flavor chemical dissipates.
Potatoes get unpleasantly sweet because some of their starch turns to sugar.

Some other interesting info: Did you ever think about why the meat compartment is at the very bottom of the refrigerator?  I learned that it is because cold air sinks (just as warm air rises), and the meats need to be kept as cold as possible.

The door of the fridge is the warmest spot in the fridge.  Every time you open the door, a blast of warm air hits that area first.  So you should keep things in the door that are not sensitive to increased temps, such as dressings, etc.  You should not keep eggs there, as they need to maintain a more even temperature (this is something I didn't know, I will have to move my eggs).

Country Blessings,
Jamie