Mastercoin (MSC) would be a good addition, but getting the necessary data points might be challenging in the interim. (Google doc trade book and off-market trades).
I made it so that coins will be delisted after 6 hours of stale datapoints, it usually means there are block explorer issues.
This will also be a current challenge for including MSC, as even though the total value would be available (certainly comparable to the others and higher than most), the trades are most likely currently happening at less than 6hrs between them at this point in time.
Assuming the above limitation isnt an issue, would it be helpful to coordinate a single source of trade data so that its incorporation on the page (and for other purposes) would be easier?