JMBS
There's also some trick to prevent the outsides of the yolks turning green and tasting nasty. Perhaps it's not dropping them cold into the boiling water. Anyone know?
I'm just a new guy here, but I thought I'd chime in with what I've learned about eggs over the years.
First, when hard boiling eggs, the shells will also crack even when adding them to cold water prior to heat. It's because they form air pockets inside the shell, and those pockets start to expand as the heat rises. To prevent this I use a thumb tack and pierce the narrow end of each egg prior to putting it in the pot. I then cover it with enough cold water to cover the eggs by 1/2" and put on high heat. I then prep a bowl for an ice bath (a big bowl with lots of ice & water). As the water reaches a rapid boil, as mentioned in an earlier post, reduce heat to medium/medium-high and let them continue to boil for 12 minutes. Immediately remove from the hot water using a spoon and place in the ice bath for 2 minutes. This is what prevents the yolk from turning green (I forget the reasoning now). At this point, I know some folks put the eggs back into hot water for 2 additional minutes, claiming this helps release the membrane between the egg and the shell, making them easier to peel. I don't bother with that. Another thing to note is that fresh eggs stick more, older eggs are easier to peel.
With fried/scrambled eggs, if you're using the cooking spray (I don't like the way butter makes my eggs taste), I've found it has a lower heating temperature and if you add it too early then it gets "smokey". I allow the pan to reach heat first (Medium) and test it with a droplet of water. The water should sizzle and just start to pop a little for medium (where as it would pop around sporadically on high). Then be liberal with the cooking spray, and add your eggs.
For scrambled eggs I add them to a bowl with high sides and add just a splash of milk. Tilt the bowl at about a 35-40deg angle and, using a fork, not a whisk, beat the eggs using a high lopping/lapping motion (it'll sound kind of like sloppy sex, actually...). This breaks down the proteins (but doesn't affect the actual "protein" nutrient) that make the egg "clingy", resulting in a lighter, fluffier scrambled egg. I also remove the egg from heat just before they're fully done and allow residual heat to complete the cooking process. This prevents them from being over-cooked and rubbery. It's at this time that I like to add my shredded cheese, as I find when adding them to uncooked eggs it is exposed to heat too long and sometimes hardens or scorches.
Again, these are just my experiences. I'm no expert, or anything. But I hope something I posted is at least a bit helpful.