Hi again I found this link in my inbox this morning and thought you may be interested.
Healthy Living Blog - Healthy Living Center - EverydayHealth.com
It is literally about the "health benefits of going meatless".
Allinaugust- I would definitely agree with the transition method. If you cut everything at once it just doesn't work- you get too many cravings.
When I was a kid I first cut out red meats - my mom convinced me for a while that chicken and tuna were still ok, I think she was worried I wouldn't get my protein. However, I eventually found the flaw in her logic. It wasn't until college that I cut out eggs and everything containing them ( which is no small feat).. and in the last couple of years I have ditched cheese - my only weakness.
Anywho just make sure you consume some form of protein everyday ( beans, tofu, peanut butter, nuts, soy products etc) - and make sure you are getting plenty of B12, Vitamin D and Omega 3's. Those are really the only concerns and they are really easy to satisfy.