The Wipe Free Space utility in PGP Desktop Home 8.0 and Desktop Professional 9.0.3 Build 2932 and earlier does not clear file slack space in the last cluster for the file, which allows local users to access the previous contents of the disk.
archives.neohapsis.com/archives/fulldisclosure/2005-12/0349.html
metasploit.com/research/vulns/pgp_slackspace/
secunia.com/advisories/17827
www.osvdb.org/21569
www.securityfocus.com/archive/1/419077/100/0/threaded
www.securityfocus.com/archive/1/419282/100/0/threaded
www.securityfocus.com/archive/1/419654/100/0/threaded
www.securityfocus.com/bid/15784