Any clues as to why my 06 Kia Spectra quit on me?

if it was timing belt it would have just died no slowing down it would just boom dead. if it slowly died there is a posability that altinator went out and it just ran out of power it would sloow done and then die. go and check battery. there is some thing that you can do to see if it is the belt. pull the oil cap off and have some one turn it over and look through the oil spot and see if you can see cams turn. it they turn the belt is fine. if there is nothing moving in there then belt is probably broke. you will have to check then if the engine is a interferance motor where the pistons hit the valves.

is there oil under the car?

timing belt is a option, could have broken a few teeth of the belt

first of all do you have any power? lights, radio, dome lights. etc. it could just be a bad ground or maybe your battery is not holding a charge or bad cells. when you have a bad timing belt you will have problems starting the car all together. it will run rough no compression, maybe even back fire. also check for leaks like fuel lines you could have a bad fuel filter or pump..

There is no oil under the car, the engine won't start but radio, lights and a/c still work. Thanks for all of the help everyone!

does it turn over at all?

Have an '06 Spectra EX. Lights, dome and radio out. Where would I find the "ground"?

Look for a mechanic on Craigslist in your area.