I recently bought 2 nucs from Brushy Mountain along with some other hives components because everybody says you have to have some nucs ready, and I couldn't pass up the free shipping :-) . I found out what you all mean after using one to shrink a weak hive today. Where they couldn't handle the space of a full deep before, they are full now in the nuc, well, almost.
So my question is this - I understand using a nuc for catching a swarm and for the use I just experienced. What else can I do with them?