As a developer in our group said, this isn't a killer enterprise app, it's an enterprise killer app.

If you're feeling a little too productive, check out this article by Woo Seok Seo where you are shown how to create a Tetris application in Excel using Visual Studio Tools for Office 1.0.  Crazy stuff :)

http://www.codeproject.com/dotnet/seoexceltetris.asp