We had a good marinade thread about a year ago, until it was pulled (closed topic here). Another addition that can dress up an otherwise ordinary piece of meat is a sauce or glaze.
Last night I made boring pork chops on the grill (just salt and pepper), but I dressed it up with a maple glaze which made it quite tasty.
5 Tblspn pure maple syrup
4 Tblspn cidar vinegar
2 tspn dijon mustard
Combine ingredients, and heat over med-high flame until reduced and thickened... about 5 mins.
So, what are some of your favorite sauces and glazes?