Ideas for Pickle Brine Reuse?

Marinate an entire pork roast in pickle brine, then top it with mustard near the end of the cooking cycle, and you'll never go back.  (You'll also start buying more expensive pickles, to get better brine.)  The whole 'vinegar, sugar, salt, spices, dill' combo isn't that uncommon as a cooking technique in the first place - I just make my own 'pickle bring' sans pickles and use that.