Automatic Mike Muter - build a "magic carpet" that lets your mike go live just because you stepped up to it!
The following two items are things I had intended to type in. Much to my surprise, I found almost exactly what I had formulated in my mind already existed at J.D.'s web site. Way to go, JD!!
Build a pedalboard and case
A Stage Survival Kit - what's in YOUR parachute pack?