To make the switch to a vegetarian diet is easy, I recommend the Vegetarian Starter Kit from the Physicians Committee for Responsible Medicine (PCRM). They also have a 21-Day Vegan Kickstart Program complete with meal plans, recipes, resources, and educational webcasts.  Also, note that Calorie Count has a Vegetarian Forum and Groups focusing on Vegetarianism.  Generally, people following vegetarian diets have more healthful eating habits and are less likely to become overweight.  For complete nutrition, vegetarians should include a variety of whole grains, legumes, vegetables, and fruits and take a daily multiple vitamin or other reliable source of vitamin B12.