Very cool.

A graph of difficulty over time would be sort of neat.

Please also consider some explanatory language or a short FAQ explaining what no Monero block explorer could ever do because of the ring signature architecture of the currency.  This highlights the privacy/anonymity features of Monero.  

Interacting with a explorer like this -- especially compared to the current, somewhat clunky command line daemon and wallet -- really presents a "teachable moment" about the core differences between Monero and all the coins that have come before.  The average user, new to Monero, will want to try something like inputting their public address to see their balance.  But they can't (right?), because it doesn't work like that!  A short FAQ about what can and cannot be divined from the Monero blockchain helps to educate newcomers that what they are seeing is not a shortfall of your explorer, but rather a feature set of this coin.