ExpressionEngine by EllisLab is a powerful, flexible content management system (CMS) that many designers (and their clients) love.
Various modules exist to allow EE to be used for a number of different purposes, such as membership sites, ecommerce, blogs, wikis, and much more.
Many of the most popular modules come with the personal ($99.95) and commercial ($249.95) […]

More at: http://www.webdesignerdepot.com/2010/01/40-excellent-websites-showcasing-expression-engine/