Hey, I don't know about you guys, but when I filled out my AMCAS (and AACOMAS) by semester, it asked specifically for the name of the school where the courses were taken. And, yes, the schools did get this information.
Overall, I agree with mig, if you can go elsewhere, do it. However, I got in with about 65 hours of CC courses (although, most of them were gen. ed. courses--only a couple of med school pre-reqs). It can be done, but it makes life a little more difficult.
If the only reason you (meaning anyone) want to take CC classes is because it will be easier to make the grade, how will you deal with the difficulty of med school? If other circumstances (family, work, etc.) dictate taking courses at a CC, and your choice is take pre-reqs at the CC now, or wait and take them at Large U. later, I would say take what you can now, and explain your reasoning in your PS (i.e.--"I learned to handle a difficult workload by working 45 hours a week while taking basic pre-reqs at Al's Comm. College......"). The thing to remember is that if you take all science pre-reqs at a CC, you must take upper division science courses at a 4 yr. school to show that you can grasp the complex points of such courses.