It's all really quite simple: You enter a long and unruly url, press the Scurry button, and in return get a number of short, quick urls that are easy to remember, jot down, or communicate verbally.
For example, the url http://www.spiegel.de/panorama/leute/0,1518,510187,00.html is converted to
- squrl: http://squrl.us/2b
- mobile: http://m.squrl.us/2b
- cache: http://c.squrl.us/2b
- translated: http://t.squrl.us/2b
The squrl is just a redirection to the original link, the mobile link uses Skweezer.net to render a mobile-friendly version, the cache link goes to the Google cache for the url, and the translated link is to Google's automatic translation service (note this only works for non-English pages).
The whole thing is running on ASP.NET 3.5 with C# 3.0 and Linq (for the heck of it), and SQL Server Express 2005 (this may be migrated to MySQL 5.0 due to server constraints).