Oxtail is great. Since it is now much harder to find meat bones (at least for me), it's one of my go-to items in terms of making a beef stock.
Salt and Pepper the pieces, then get a good sear on it (brown meat is tasty meat), deglaze with a water type substance (wine, apple juice, plain water, etc.) scrape off all the brown bits and throw it all in your stock pot with your veggies (carrots, onion, shallot, garlic, and celery for me), your herbs and spices (salt, pepper, rosemary, parsley, sage (no thyme for me...sorry S&G fans) and any other flavors your might want tied into a bouquet garni. Add in the appropriate amount of water and let it simmer until ready (many hours unless you use a pressure cooker). Once done, strain and toss the solids. Gives the deep rich taste of a broth, with the mouthfeel of a stock.
I use it mostly for cooking a beef and barley vegetable soup (nothing beats this for a cold winter day, not even chili), beef stroganoff, or even for simple things like cooking rice.