Aaron:
What kind of car, and can you tell where exactly the fluid is coming from?
Not always the easiest thing to tell, as when it leaks it will streak down the underside of the car when you drive. Things can get....gooey, for lack of a better term.

It might be something simple enough for you to do yourself, like a leaky cooler line; or something slightly more complicated, like a bad pan gasket. About 90% of the time it's going to be a cooling line on the pressure side that starts puking fluid.

If crawling under it with a flashlight doesn't show where the leak is, try parking over spread out newspapers; when you move the car you should be able to see where it's been dripping.