Since there's a lots of phpdoc-like php documentors and the like projects on the webs, and they are all named similar if not equal, I wanted to write a little overview:
phpdoctor of 02/2011
Currently using this, namespace support plus UML stuff.
phpdoctor of 01/2011
Didn't test it, looks good.
phpdoctor-fork of 04/2010
Didn't test it, fork of above, making namespaces first-class-citizens
PhpDocumentor PEAR of 09/2009
Didn't test it, but seems to be capable of alot of output formats etc.
Phpdocumentor.org of 08/2008
Did use this in the past, but package system is hard to maintain and impossible to use with namespaces.
phpdoc.de of 03/2000
Didn't test it, marked as beta, very old, uhm yeah.