A list of links for your reference. Feel free to post your own below and I'll add them here!

Cats International
-I found this had some fun/interesting stuff about cats when I waas in the looking process.

Ingredient Dictionary
-May not be the absolute best source out there, but fairly handy for a quick check on more info about something you see in the ingredients listing of a food.
-the base site also has links to various product sites based on what they carry, which I personally find handy instead of saving or trying to remember such websites.

Dog Food Anaylsis
-While obviously dog-versions of products and all, most companies have kitty equivalents, so it's handy for a basic quality check

Cat Food Reviews
-Here is a link that will allow you to assess a wide variety of kibbles. It lists ingredients, grain free food, and commercial cat food. It also allows you to view price and availability. Remember when selecting a food for your kitty, that it contains taurine, high protien count, and fits the lifestyle of your cat.