OK, I know this is a really dumb question, but I don't know the answer. One of the grocery stores in my area sells Grade AA Eggs. All the other stores sell Grade A eggs. Are the Grade AA eggs better or worse?
I think that has something to do with size..
What's important is that the eggs are fresh and not contaminated.
To me I prefer Jumbo ones. BTW your question is not stupid.. 
Thanks so much, I didn't want to use them for a cake if they were inferior quality!
It's not a stupid question! Eggs are pretty darn key to our cake baking -- it's important information to have!! 
I found a bunch of good info on the internet about this -- here's a link for you to check out:
http://www.ams.usda.gov/howtobuy/eggs.htm
About halfway down the page they talk about egg Grading, etc. It even includes pictures!! 
Enjoy!
...Andrea
AA should be better, but I myself would look for the freshest eggs.
I don't get it. Eggs have a shelf life of about 6 months. Then when I buy them at the store, they have an expiration date of about 2 wks. I understand maybe Walmart and Aldi might get the least fresh eggs for the best discounts. But even the ones I got at Hen House last time ended up expiring that soon which is not typical of them (plus, they are supposed to be local eggs). I don't know how they can pay to store them for months, transport them, and still sell them for less than a dollar. A mystery.
I don't understnad how stores can charge so much for eggs. Out here in California eggs are sold for as much as $3.49 a dozen (Yikes!) and they aren't any fresher for it. Even the 'free range' eggs are old!
I can buy my eggs at Walmart for just a little over a dollar a dozen, or I can go the 99 cents store for a couple of dozen (they limit how many we can buy), or I can just go to Costco and buy 18 eggs for $1.18. Guess where I buy my eggs if I am not in a hurry........?
My grandfather used to grade eggs when he was young and he told my mother that to ensure the freshest eggs look carefully at the shells. If the shell of the egg is smooth it is fresh. The more bumpy the shell the older the egg.
I only buy free range organic eggs as I worry about the battery hens with their clipped beaks and cages the size of a piece of paper. I'm based in England. Do they have battery hens in the states, do people buy free range to avoid them? I'm interested to know what goes on on the other side of the pond.
I've never heard of a battery hen, but I'm guessing it's not a good thing. Where I live, free range/organic eggs cost up to $5 a dozen. 
I just buy regular eggs for sometimes less than $1 a dozen. As much as I'd rather use free range/organic eggs, I'd run myself out of business if I spent that much on eggs. 
I keep my own chickens now as organic free range are expensive but I can't being myself to consider the alternative. Our chickens are gorgeous and I have a handy suppl of eggs for cakes!
I wish I could have my own chickens. We live in a subdivison, so I don't think our neighbors (or the city code enforcement officers, for that matter!) would be very happy if some chickens showed up in our backyard one day. 
Maybe someday we'll be able to live out in the country and have fresh eggs every day .....
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