Just bought a used VW Jetta GLS. Noticed oil was a little low. Put oil in and everything was fine. Got a oil change. And drove my car 70 miles home. Woke up this morning to find a puddle the size of a 1/4 quart. Wanted to know if this sounds common???

No, this is not good. Check your oil to see how low it is. It may have lost considerably more than that in the 70 mile drive. If you have not noticed any oil leakage prior to getting the oil change, you need to return to the facility that changed your oil and have them check to see where the oil is coming from. Common mistakes at "lube joints" is failure to tighten the oil filter and drain plug, and leaving the old filter gasket on the engine. You say you just bought the car. Did you happen to notice any oil under the car where it was sitting before you bought it? If you bought it from a used car dealer, give him a call and ask if there is a problem he neglected to tell you about. If it is a serious, and potentially costly problem, you may have recourse.