Good advice, Rick; I tend to forget that I'm one of the apparently rare people who are more likely to underwater my seedlings!
Jeanne, just to give you some perspective about the planting calendar... for my zip code (49807) the calendar says that my frost-free planting season starts May 10th and to start tomatoes indoors around March 1st. Bwa-ha-ha-ha ! In my wildest dreams that would be true... (and even if I COULD put the plants out on May 10th, March 1st would still be a couple weeks too early, IMHO. As it is, my tomato plants are at least a foot tall, if not more, by the time they get outside (and that's with going from my indoor light setup to the greenhouse around the end of April or early in May, where they get better light and cooler temps).
