Even if you don't break them out in first chart I hope you add more pools to the "unknown" section" and maybe have a seperate break out for the "unknown".
Bitminter for example has public API here:
https://bitminter.com/api/pool/statsAlso given p2pool is a very cool technology not sure how you can get the hashrate but if possible p2pool should be included. Anyone know if there is an API/webpage type method to get current p2pool hashrate?