Pork fat rules!!!! The sulfates in the bacon will gitcha, though, but if you're eating the bacon, save the grease and use it to make all kinds of yummy stuff. Use it to make pie crust for any meat pie, or for biscuits that will be served with soup or stew or with breakfast (not for putting berries on, though!) Use it to saute anything that a slight bacon flavor would enhance....green beans, collards, browning beef for stew, etc.
I used to use it extensively, now I don't buy bacon at all. I will buy a BLT if I have to eat out now and then (like once a year) and truly miss bacon. I hope to raise my own pigs soon and make my own sulfate-free bacon (thanks, Jason, for the smokehouse inspiration!) and then I will save every stinkin' drop of bacon grease again!
To make a high-quality lard, you need to buy leaf lard from the butcher and either grind it or dice it up fine with a knife and render it and strain it. It makes the best pie crust on the planet.
I save chicken fat and do a lot of cooking with that as well. I have never saved beef fat. Not sure why. Mom never did, I guess that is why. Or maybe it is just because PORK FAT RULES!!!
I am not afraid of high-quality animal fat. In moderation. Our bodies need it for many functions, and besides.... Yum!