Spirex is a manufacturer of machine parts for the plastics industry. In 2003 they needed a new web site to more effectively promote their products and services. The site was built then and has been evolving ever since.
One of the most compelling aspects of the site is use of several return-on-investment calculators. They were built using ASP.NET and take advantage of a third-party .NET chart control that displays the calculation results graphically for maximum impact.
The site also takes full advantage of various media, including animations, videos, photos, graphs, and PDF documents. (Much of the media development was project managed by Brian Norris.)