I've been thinking about how to better optimize what I eat to ensure that I am getting a balance of protein, omega-3, vitamin D & E, and other micronutrients.
I saw an interesting chart today on Savvy Vegetarian, that provides information on how to complement different foods to get complete proteins.
NIH has a useful fact sheet about vitamin D natural sources and supplements.
I also love love love the Kalorietastic Konfabulator on stumptuous.com, which says very clearly an important piece of information that I know but can't seem to ascribe to: vegetables should form the largest proportion of your meals. easy to say, hard to do.