As of today-now, Wed Jul 30 20:27:30 UTC 2003, some of these areas are no more:
http://www.xray.mpe.mpg.de/~ach/ptk/ppm/ is gone, the parent redirects to a new server and it appears that Achim Bohnet is out of the PPM biz (there's a site but no mention of .ppm 's on it).http://www.xray.mpe.mpg.de/%7Each/ptk/ppm/: 16:16:22 ERROR 404: File Not Found. http://dada.perl.it/PPM/: 16:16:34 ERROR 403: Forbidden. http://rto.dk/packages/: 16:17:17 ERROR 404: Not Found.
Dada's site has always been flickery.
It probably would not be too hard (famous last words!) to cobble together some Perl to query this list of sites for ppm packages and see what's where. I managed an inelegant pass at this tonight using just wget (to build up a group of indexes) and HTML::TokeParser (to extract URLs from those indexes). Doing it elegantly in pure Perl is left as an exercise for the next reader, or for me when I acquire a round tuit.
Or, use PPM.pm itself as this node guides you to do.
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