Harvy's whisper trick is always a good one, as are several on this thread:
http://recpit.prosoundweb.com/viewtopic.php?t=4330
I like printing all the vocals and snare hits backwards and upside down and putting it on it's own track as a kinda roll into a tight snappy hit on a first word of a line, etc. Easy to overuse, so be careful.
nat