I found a useful chart for when to plant what in my zone:
(Source: http://www.veggieharvest.com , and you can get the calendars for other zones at http://www.veggieharvest.com/Table/Vegetable-Planting-Calendar/)
So far I've planted peas, beets, radishes and lettuce outside - although the bunnies already ate the tiny lettuce seedlings ... sigh. I also started a few herbs, tomatoes and peppers inside to transplant after the frost-free date. In Zone 5, that's around Memorial Day, although I might try to jump the gun this year with a few of my plants. Last summer, the neighbors were harvesting tomatoes probably a MONTH earlier than I was ... maybe I was a little jealous ;-)
