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Re:Basecamp and Backpack from 37signals use PHP by Lessien on Tuesday May 29, 2007 @07:09AM (#25179)
http://37signals.com/index.rhtml also works.

As does http://37signals.com/index.nothingspecial

Apparently, the file extension is irrelevant when processing pages.

Re:Basecamp and Backpack from 37signals use PHP by brett on Tuesday May 29, 2007 @12:43PM (#25240)
it's more than file extension

http://37signals.com/here/is/a/bunch/of/nonsense

(though that does throw off the path to the css)