I am yet to meet somebody who doesn't LOVE Black Dog Smoke & Ale House. This little hole in the wall packs genuine barbeque cuisine unlike anywhere in the vicinity of C-U. Yes, you may have heard it's a small restaurant with a perpetually long wait, but it's worth walking around adorable downtown Urbana for awhile before you're seated. I've also done a carry-out with several other people which only took about 25 minutes to prepare.
There's a variety of BBQ sauces from mild to hot listed and detailed on the menu. My personal favorite is the Texas Sauce; it has that smoky flavor I expect out of Midwestern Barbeque. Also, you haven't really lived until you've tried the brisket sandwich.
As for side dishes, my friends and I swear by the Twice Baked Potato Casserole. The sweet potato fries are irresistibly sweet and caramelized. Overall, Black Dog provides a one of a kind cuisine.
Also VEGETARIANS-- there are some delicious options for you, too.