New in 6.5.1:
PGPnet (secures all TCP/IP communications), Self-Decrypting Archives (SDAs), automated Freespace Wiping, Microsoft Outlook support[better?], HTTP proxy support, smart word wrapping, fingerprint word list, integrated PGP command line;
More detailed release notes:
http://web.mit.edu/network/WhatsNewWin.htm
Download:
http://web.mit.edu/network/pgp.html