I always like to add a little bit of chocolate and about a half cup of strong coffee to my chili. I know it sounds kind of weird, but I got those two "secret" ingredients from talking to people at chili cookoffs. It really works nicely. Also a little masa flour at the end really adds a nice corn flavor, and works as a thickening agent.
"Beer is proof that God loves us and wants us to be happy."
My chili recipe is very simple, but it turns out pretty good:
1 lb. Ground Beef
1 can rotel tomatoes
1 can beans (I prefer black beans, but pintos are good too)
a "bunch" of chili powder (I usually just dump a bunch in there, since it helps everything thicken up, and adjust to taste from there)
Hot sauce to taste
That's the base, then you can start adding other stuff - I usually go with some finely chopped peppers and onions - I have been known to go with BBQ sauce on occasion.