I had to toss an egg last night. 102 eggs in the incubator now. 

I checked the incubator and noticed a shell was cracked really bad. Fortunately this egg didn't develop. I was also fortunate to find that the membrane hadn't broken, just the hard shell. The membrane held in the contents of the egg. I guess it was going to get tossed anyway... I didn't see any blood ring or any other signs of harmful bacteria. I'm hoping the crack didn't somehow cause a spread of any bacteria, fungus, other nasty things that could harm the developing embryos.
I did quickly shine a bright flashlight on several of the other eggs in the incubator and there are nice air sacs and dark masses where it's clear a chick is developing along.
Lockdown is Sunday night. Expecting hatches Wednesday night into Thursday. I'll probably be pulling an all-nighter and then dread going to work on Thursday. My wife will be home though through the whole process. She's not going to want to intervene I'm pretty sure, but at least she'll be able to keep an eye on them. I'm hoping most of the hatches happen while I'm around to keep an eye on them.