Another question I asked a few pages back...is there a way to show the top ten miners in a pie chart or something? Would be interesting to know how many large farms are mining SpreadX11.
It should be possible to crawl the blockchain for which address has mined each block. I could probably script this if I could build a local block explorer...

That may be as close as you're going to get though - just as it's impossible to assume true coin distribution via address as someone can have multiple wallets/addresses.