There are several layered taco salads listed here
Cooks.com. Can't vouch for them, but they all sound good!
I've done the "usual" mixed taco salad in the past - i.e., taco seasoned ground beef, lettuce, tomatoes, shredded cheese, green onions, black olives, taco chips, catalina dressing. (There are a million variations out there - some add beans, green peppers, jalapenas (sp) or use ranch dressing or salsa).
I don't see why you couldn't just layer all the ingredients, but I'd hold off on adding any kind of a "runny" dressing until just before tossing & serving.
BTW, I've also made the 7 layer dip for parties that piratesmate posted - always a real winner!
Denise < --- it's 11:45 pm and now I want a taco salad...