Agroforestry means farming with trees or shrubs alongside crops or livestock. Here in Britain the Agroforestry Research Trust (AFT) and the Farm Woodland Forum (FWF) promote research and knowledge transfer about agroforestry. AFT offers a summary of what agroforestry is about.
My fellow blogger Anthropogen tells us that agroforestry is regaining popularity in parts of France and that, around the world, agroforestry might be useful in adapting to climate change.
The Royal Forestry Society says that agroforestry has something to offer Britain. But Ed Hamer at The Ecologist magazine questions whether British farmers will turn to agroforestry.
Science on the Land 
Here’s a link to the EURAF, the European Agroforestry Society webpage: http://agroforestry.eu/uncategorized/welcome-to-agroforestry-eu/
The Agroforestry Research Trust is also a great UK-based resource/website: http://www.agroforestry.co.uk/
The AFT link is in my post above. Thanks for the EURAF link.