I let them cool somewhat on racks on the counter, then vacuum seal them in ones or twos with doubled HD foil folded along the sharp bony edge so that I won't get holes poked in the bag material. I then toss these packages into an ice-water slurry to chill quickly, then refrigerate or freeze.
Many have good luck with reheating them on the grill, but I prefer the boilin' bag method. When it's about 30 minutes from time to eat, I set the cold sealed bags down into a big pot of water, bring the pot to a simmer, and the ribs are hot, fresh, and ready to eat in about 20 minutes. We did this just yesterday at my sister-in-laws house for Thanksgiving, using a turkey fryer on the back porch to heat the water so as not to take up kitchen space.
I buy the 8" rolls of bag material for ribs and chicken pieces, and for making 1-lb packets of pulled pork and chopped brisket for the freezer. While I prefer to let the meats thaw before dumping the packages into the water, I have often taken a slab of ribs or packets of meat straight to the boilin' pot with good results as well.
Keri C