Try leaving them in the house. They really don't need light as much as soil temp until they get going. Just put them in a room with a window for a few days.

They can take a while to germinate - perhaps you should try between moist towels in a plastic bag first - ? That's what I do, and then I carefully plant them in their containers.

I usually have pretty good luck starting toms, but some varieties seem to take much longer than others. I start my seeds using a sterilized seed starting medium with bottom heat in a clear storage container (to keep humidity up so I don't have to water until they have sprouted). I've read that using soil is not a good way to start seeds since soil may contain pathogens that can cause damping off.
Tim

How long ago did you start them? And were they outside? If you're in zone 5, it's been too cold at night, but inside is great, especially near a heat vent until they sprout. I use self-watering containers because I am bad at keeping seedlings evenly moist. Peat should be great for starting them.
Also, once they do sprout, my dad said not to plant them outside until Memorial Day! I wait until at least after Mother's Day, but mine are pretty big already.
You might want to ask this on the tomato list, if you haven't already.
Amelie