os x security, and network security

http://www.obdev.at/products/littlesnitch/order.html

good discuss of how to get rid of a rat
http://forums.macrumors.com/archive/index.php/t-658685.html

microsoft
http://technet.microsoft.com/en-us/library/dd632947.aspx

viruses and precautions etc
 http://www.webologist.co.uk/internet-news/gumblar-virus-threat-to-the-internet-how-to-remove

encryption of files
http://trac.filezilla-project.org/ticket/5530
http://blog.unmaskparasites.com/2009/09/01/beware-filezilla-doesnt-protect-your-ftp-passwords/
http://www.codefuzion.com/applications.html
http://josephbales.com/2009/01/05/encrypted-text-files-on-mac-os-x/

ftp/ ssh
http://en.wikipedia.org/wiki/SSH_File_Transfer_Protocol
http://www.panic.com/transmit/

wifi
http://stopdesign.com/archive/2005/02/07/secure-email.html

also searh corsaire whitepapers securing mac os x - good walkthrough of alot of stuff
http://research.corsaire.com/whitepapers/technical.html