Are you looking for a farming internship, or a job in the food/sustainability fields? Check out these sites.
ATTRA Sustainable Farming Internships/Apprenticeships
Backdoor Jobs: Short-term Adventures
Farm-Based Education Association
Good Food Jobs
Maine Organic Farmers and Gardeners Association
Northeast Organic Farming Association of New York
Orion Grassroots Network
Sustainable Food Jobs
Tilth Producers of Washington
Resources for New and Beginning Farmers
Starting a new farm can be difficult, what with lack of capitol and the difficulty of land access. But there are some organizations out there that can help provide information, training, and resources.
Future Farmers of America
Land Stewardship Project
National Young Farmers' Association
New England Small Farm Institute
Garden Like You Mean It
Growing your own food is about as local as it can get. Here are websites with resources for gardening sustainably and organically.
Garden For The Environment
Some of these blogs aren't active anymore, but their archives still contain a wealth of information for anyone interested in WWOOF-ing or working on a farm.
From Work to WWOOF
Volunteer Migrant Farmers
The Practical Guide to WWOOFing - Adam Greenman