I had to trade a percentage of my soul to get a copy of my friends recipe... so I can't post it... but here are some tips/tricks for chili in general:
Hint: Whatever chili recipe you use... melt a couple ounces of high quality dark chocolate above 60% (like callebaut, valrhona, etc.) or medium quality (like ghirardelli) into it. Unless you're a supertaster you won't be able to taste the chocolate at all, but it adds a richness and depth to the chili that is incomparable.
I also prefer, when I can afford it, to use buffalo instead of beef. Again, because of the complexity of the flavors is different. The fact that it's better for us is just kind of added bonus.
Ditto... a bottle of dark beer poured in (like Guinness or stout) is a great add. If you're using a turkey chili recipe, however, go for an IPA. Pork chili... hard apple cider.
More "extras":
Try sprinkling crumbled goat cheese on top, or sour cream. And green onions and bacon.
Yum.
Chili.
I think I know what dinner tomorrow is going to be!