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As mentioned in this new post on the PHP Magazine website today, the United States Equestrian Federation has made a move on their site to an all PHP-based setup.
The United States Equestrian Federation (USEF) boasts almost 100,000 individual members, holds more than 2,700 member competitions, and has 100 affiliate organizations. All these records are managed in the USEF with PHP programming.
In the original press release it references, they also note that the Show-EZ system, which the horse entry section of the organization's site is based on, has only been around for a little while but has already proved itself invaluable. It even bosts the ability to be used via a Blackberry/Pocket PC/cellphone for the ultimate in mobility during shows.