Another tool that I added to the fray was a RRampMeter from DCC Specialties. I saw these in use at several open houses during November and I immediately recognized its benefit.
Although initially released for use for measuring track power directly off of the tracks, everyone seemed to be using right at their command stations and boosters.
The RRampMeter, inline with the power bus, displays voltage to the track as well as current draw in amps. With the RRampMeter you can tell when you are approaching max amperage on the power bus.
I purchased one, and mounted it, but modified my wiring so that I can move it between command station and boosters with little effort. I may eventually add additional RRampMeters on the boosters.