Wow - lots of good info here - I don't buy the 'omega-3 eggs' at twice the price, 'cause if I want omega-3, I'll eat fish! It's like putting calcium in Tums to get peeps to buy more Tums!
I do, however, buy free-range eggs farmed locally by the Mepkin Abbey monks; their chickens are -truly - free range, they have a huge yard to roam around in, and are outside all day. Sparrow, your info on free range was fascinating, and I'm sure true of the 'big' producers; but - if you can find a small, local farm, you'll find some of the most delicious eggs.
I can honestly tell a difference between the free-range eggs and 'regular' eggs. The free range eggs just have a richer taste.