have you tried covering them with plastic wrap?
how warm are they?
don't water from the top, if you didn't know that..
I lost all my snapdragons, lavender, and tomatoes because of damping off, which is from watering from the top.. had to start over.. :p
only water when the soil is dry, then don't water again, until it is dry again...water from the bottom, let the water absorb into it.. then take it out once it's wet at the top...
maybe what you're planting takes a while to germinate? I know things like columbines take a while..
I'm not exactly sure as to what else, because the things I restarted won't sprout..