I use a Gibraltar Rack. Saves a lot of time because I don't have to adjust any cymbal/tom arms, they just go on and off the rack. Memory locks and I use the 1/4 inch colored dots that Avery makes. I can get away with four colors by going in single, double, triple code. (yellow, red, blue, green, 2 yell, 2 red...) Because the dots are only 1/4 inch big you can place them on the memory locks and the clamps and hide them from the front view. It also makes it easier for someone if they are helping because everything is color coded.
I also use a carpet with tape marks on it. I put a "U" were the bass drum pedal sits and then a little marker where one of the lugs of the bass drum aligns with it to make sure the pedal is centered correctly on the drum.
The Vater Slipnuts also save a lot of time with the cymbal set up.