The Flatterist was built by Steve Marx (who also voices all the compliments), inspired by suggestions from Amy Conklin (@amyrc), Vikram Rana, and Todd Proebsting.
This app started its life as a Windows Azure demo, but it's now running on Steve's startup's web hosting platform, Site44, which turns Dropbox folders into websites.
If you'd like to see the source code for the Windows Azure version, you can find it on GitHub.
The background music is Piano Moods 1 by Klaus_N (CC BY 3.0).
The logo font is Pea Olson: