Want to know what's in season? Interested in seeing what foods you can look forward to next month at your local farmer's market? A local foods wheel is an attractive addition to your kitchen that can answer these questions.
Unfortunately, there doesn't seem to be one for every region, but perhaps some commenters can point me to more.
Jessica Prentice's wheels are beautiful with bright colors and wonderful illustrations. She has two: one for the SF Bay Area and another for NY Metro Area. Comparing them is fairly depressing, I'm admittedly jealous of the year round bounty in San Francisco. The NY one has the addition of a larder, which shows foods available year round like beef, so you can feel better when you turn the wheel to December and only see some turnips.
Chew On This also has a NY Wheel, which is much more detailed since the creator lives in NYC, but less colorful. The Forty Culinary Herbs wheel is the real treasure, as it shows herbs you never would have thought to use and different ways to use and preserve them. It's a great way to find ideas for a simple quick supper as it shows what herbs go best with various ingredients like poultry or fish. I've been cooking with lots of fresh herbs lately and also growing them myself. I don't think I'll be able to grow all forty in my apartment though!