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Re:Basecamp and Backpack from 37signals use PHP by paulgb on Tuesday May 29, 2007 @05:32PM (#25279)
The server headers confirm this.

Server: Apache/2.2.4 X-Powered-By: PHP/4.4.4

Re:Basecamp and Backpack from 37signals use PHP by bdr on Tuesday May 29, 2007 @05:49PM (#25283)
But what about Netcraft?