No, none have hatched yet.  Today will be day 24.  i have a feeling that today will be the day they either make it or not (although i will keep the incubator on until day 28).  i have kept the temps between 101 and 102, humidity at 70%.  i do see movement during the day, like they are trying to peck out, but no one has made an actual crack yet, just teeny holes.
Bawade, i had read you shouldn't try to help a chicken out of the shell.  i have read of someone helping a little with chipping some of the shell once it's pipped.  But you crack them open and they're fine?  i would be willing to try that, if it wouldn't kill them in the process.
Ellen - i don't know what i'm going to do with the ones that don't hatch.  i'm not sure i can handle seeing a perfectly formed chick that didn't make it.  Or maybe opening an egg and seeing one still a little alive.  Those scenes weren't what i imagined when i first considered incubating.  i was thinking, put eggs in, 21 days later out pops a fuzzy herd of chicks.
Thanks all for the good wishes.  i will post pictures if i have some luck.
Colleen