Most of the artwork on our site was created by us.
We used several Google sourced images:
Math Symbols: http://www.albany.edu/tmu/events/conferencevideo.html
James Madison Dollar: http://images.google.com/images?gbv=2&hl=en&safe=active&q=James+Madison+Golden+Dollar&btnG=Search+Images
John Adams Dollar: http://images.google.com/images?gbv=2&hl=en&safe=active&q=James+Monroe+Golden+Dollar&btnG=Search+Images
We used the Pi website created by Mr. Michael D. Huberty and his associates while they were in college:
http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits.html
Mr. Huberty, who now teaches High School Mathematics, graciously permitted us to list his site on the Pi page of our site. If you would like to see more great upper level mathematics you can visit his current website at: http://www.moundsviewschools.org/moundsview/departments/math/mikehuberty/index.htm
We would also like to thank Lishka DeVoss, the creator of KrankyKids.com. She helped us learn Adobe Dreamweaver CS4, and lended us ongoing support.