Quick question - for the ignorant (me)

I am always curious where people get the stats on matchups. :D Link?

Also, it would seem to me that any win rate that is 48% would counter any argument about imba, wouldn't it? I mean, I know you specifically are stating that toss isn't imba, but I don't personally know if people consider that close enough to count as balanced.

Oh and it would seem to me that the races aren't balanced necessarily at the bronze-platinum levels, yeah? Anyone have any idea at what level they really start balancing? Does Blizzard balance solely for the pro level, or do they consider all of GM? Or include Masters, Diamond, and so on? Thoughts?