Hmm, these stats are great, but they puzzles me; a couple of things:

1. You should note what is on y axis (I guess it's "Rated price (BTC/MH/s)", it's quite obvious, but anyway ...).

2. You should display the y scale for other values as well (at least "Hired hashing speed (MH/s)") ... otherwise I have no idea what was the value of "Hired hashing speed (MH/s)" in a particular point in time.

3. Are you sure that the "Hired hashing speed (MH/s)" is correct? I don't believe that it fluctuates that much ... are you showing the exact hired power for each particular point in time, or are you showing the power that was rented in a particular point of time (for example, on "Thu Mar 06 21:45:39 CET 2014" Scrypt 3.35 MH/s has been rented) - so, are you counting rent events or actual rented power?