The levy calculator over at OLSDLevy.com has a neat, slick user interface. But it is chock-full of material errors, rendering it of little analytical value.
I believe this is the work of the gentleman who created a similar site for Westerville. Regardless, if you are looking to understand the financial issues around the Olentangy levy, OLSDLevy.com is not the place for you.
Note: All is not lost, the site is salvageable. If anyone knows the creator, send him my way and I will list the errors that he needs to correct. With little effort, he could have a usable site.