I think most films these days are c-41. Anything that goes in an ordinary lab is. kodacolor and all its variations, Agfacolor, kodak's newer b&w films (NOT tri-x and the other pans, but the t-grain films)
And I'm not sure if any of the slide films will go through c-41 and come out looking normal.
You should try that, though, just for kicks! it is REALLY funny how it comes out...shoot a roll of some sore of e-6 film, and send it through the c-41 processor. Won't damage anything, and if you are not shooting to GET slides, you will enjoy the results. It works best if YOU are doing the processing.
I did it once by accident! It came out really bizarre! Not quite like printing negative slides, but entirely wierd!