Johnny-
I read it. His treatment of time travel was as good as it gets. The methods proposed for achieving it, to me, seemed absurd. I really doubt that frying something with mega-lasers and using a super computer to keep track of the smoke would ever make anything more usefull than a high tech garbage disposal.
Timeline is a good NOVEL. If you want the skinney on TT try a text book titled Modern Physics or the like.