I like to layer snares quite a bit... in fact all drums....
One thing that works well for me is a house snare with another layer on top highpassed at like 5k... then put a delay on it mix 100% and delay one side by 30 ms or so... this gives it more dimension (kind of like 2 hard panned guitars and one delayed by 20 ms or something... that effect.. xcept on the highpassed layer :P)
I just purchased the e2transienter... man what a nice plugin that is!!
Ive always loved snares that have heaps of midrange knock to them.. but could never make it sound the way i want to... the e2transienter makes this a breeze...
check it out...
Eiosis, Your Talent Deserves This
Also if you make 4 to the floor music ie.. house or something... use the kick as a sidechain trigger and compress the snare... everytime the kick hits the snare gets ducked a little... this makes the snare follow the envelope of the kick giving it a more glued and coherent sound... kind of like a kit ya dig!