Robyn, here are 2 suggestions: if you use peat pots and plant them in the ground, be sure to have the rim of the pot buried below the soil surface (the moisture will actually wick away from the plant otherwise), and break up or cut into the bottom of the pot before planting so the roots can escape. And, try covering the young plants with "floating row cover" for a week or two after planting; I don't even bother hardening my seedlings off anymore, I just cover them with the row cover for a while to give them a little protection from the sun and wind (and also to help hold the moisture in the ground).
Maybe that was 3 suggestions