I use a 2-piece suit, so I can remove the underwear top easily between races, which helps a bunch for us sedentary types. The last set I bought in 2006 seemed to wick away sweat better than the older sets, and were a bit thinner. I am not sure if that is due to some sort of technical advancement with the fabric or something else.
As far as cleaning, I use Woolite on the gentlest cycle and then hang them up to dry. I try to limit how much I clean them, however, as repeated washings will hurt the flame-retardant capabilities. Be sure to check your manufacturer's recommendations.