How funny - right after I posted that debate I was having about which cookbook was better - here is a New York Times article reporting that the author of one of the books is suing the other for copyright infringement!
I don't know enough about the case to comment on whether it's legitimate - but unless the content is expressly the same, I wouldn't think the lawsuit will be successful. Could the writer of one vegetarian cookbook sue another writer of a vegetarian cookbook, just for stealing the idea?
Anyway, I'm thinking I probably won't buy either book at the moment - at this point, my kids seem to be doing fine eating their fruits and veggies, especially with a little butter or sugar on them. :-)