BSO - i've also heard of brushing on a little honey just before they come off. i've never tried it, but i am guessing that it would make an excellent glaze ; sweet, crackling and fit for the gods.
one reason i haven't tried the honey yet is that i have found a finishing glaze that i learned from danny gaulden on the BBQFAQ. i take 1/3 cup each of brown sugar, mustard and apple cider vinegar and simmer them on the stovetop a few minutes, then let the mixture cool down to room temprature. a few minutes (about 15) before they come off, i brish this on all surfaces, then again right at the moment i take them off. the finishing glaze proveds a great shine, a deep-rich cherry color and in my opinion adds another dimension to the look and the aroma of the ribs. as for the taste, i know that the three above ingredients sound a little harsh, but when combined, they form a whole new flavor that is out of this world and does not interfere with the rub, mop and other flavors; rather, it adds as much depth to the taste as it does to the look and aroma. i was skeptical at first but am now a true believer in this finishing sauce.
for something a little sweeter, you might try substitution apple juice or cider for the apple cider vinegar.
if you do try this glaze, either in its original form or modified, let me know either in a post or a PM how you like it.
good luck -