heat mat installed

So I made it to the local hydroponics store this evening and purchased a 20W Super Sprouter Seedling Heating Mat for $30. It's the same size as the seed flat (about 10" x 20") and claims to "warm the temperature of the rooting area 10-20F above the ambient air temperature." Since I think it's currently around 60F on that shelf, it seems it should work out well for the tomato plants germinating there.
I also would like to amend a previous post in which I stated that "the worst that could happen [in planting the tomato plants so early] is that they flower before it's warm enough for them to be taken outside and pollinated." I found out tonight at the hydroponics store that I seemingly know very little about pollination and which types of vegetables require pollination assistance (as in from various bees). Apparently, most types of tomato plants do not require cross-pollination and can pollinate themselves with the help of some shaking. For the more difficult species, pollination can be accomplished through vibrating the flowers in any of a number of ways (electric toothbrush, for example). I'm looking forward to reading more about pollination in general, and how it pertains to the plants I'll be growing in particular.