This Siemens website was one of my favourite designs of 2009.
At the back end, is a full-featured event registration admin system, which enables the Siemens Event Team to view delegate details, which options they have chosen (hotel, diet, additional meetings etc.) and produce on-screen and spreadsheet reports in real time. To make registration simpler for customers, all their details were pre-registered, enabling them to register with just a few clicks, and even by text message.