Here is a good article from Fangraphs about WAR. I've never been a huge fan of WAR because to me its the most easily mis-used stat of the bunch. It's not useless, but its not the end of discussion (as frequently presented on this site) either.
I thought this was a pretty good read.
"All I can tell them is pick a good one and sock it." --BABE RUTH
Having better players makes "the right time" or "the big hit" happen a lot more often. PLUS PLUS