My daughter is a huge animal lover and never really cared for meat so decided to become vegetarian.  She didn't eat meat for a year and then started making exceptions for bacon and pepperoni- you know thae really healthy meats.

   I very recently (maybe two months) decided to give up meat after reading a book called Skinny Bitch.  I was literally horrified by the treatment of the animals and that was pretty much it for me.  I haven't touched meat since I closed that book.  My daughter decided to join me and gave up her pepperoni and bacon.  I am surprised that I actually don't miss meat at all.  I am not sickened that you crave a burger sometimes because I used to LOVE burgers.  If you are interested go to 
www.vegcooking.com and you can order a free vegetarian starter kit which is a little magazine.  It is from PETA but don't let that scare you off- it's got great information and recipes.  Be prepared though because I don't think anyone could read it and ever eat meat again. 
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 "If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226