Suggestion:
We arrange Exchanges into two tiers: “Main” and “Secondary”.
“Main” would be Vault of Satoshi, BTC-e, Vircurex, Cryptsy, and any Chinese exchange (btc38.com?) that has high volume.
“Secondary” would be the others. Cryptonit, Coins-e, CoinedUp and mxcNOW all had 0 PPC volume today and should be included in this group. http://www.cryptocoincharts.info/#jump-ppc-btc
We want people to be able to find the best exchanges easily.
Alternatively, we could divide up the exchange list into PPC/USD and PPC/BTC exchanges.