ripplelabs updated their page concerning the xrp-distribution
(https://www.ripplelabs.com/xrp-distribution/)
the available supply as of April, 30th 2014 is
7,817,888,647not a huge change, but anyway you might consider to adjust the value accordingly.
Updated, thanks!
What happened to GME?
It is on coinedup and cryptsy now

For both of these, need a block explorer with total supply count.
What about a mini-graph of exchange rate along with the market cap graph? The two don't always go hand-in-hand. Be nice if it could click in a historical exchange rate graph for the coin from launch to present day if possible. That would be info I'd pay a monthly subscription for.
Working on graphs where you can toggle between BTC and USD prices.