NutritionFacts.org was founded by Dr Michael Greger, the author of 'How Not to Die'. It is a non-commercial science based resource; featuring the latest facts from nutritional research in video and written discussion.
Established in 1944, The Vegan Society is the oldest vegan society in the world (though veganism has been around for longer). They are a charity that offers a range of advice on lifestyle and other issues, as well as recipes that are vegan.
See their website for more information.