January 15: Personal Firewall Day

January 15th is Personal Firewall Day.

This launched in 2004, but as far as I can tell the website hasn't been updated since then.  The website is mostly about commercial firewall software, but there are free options as well.  Whether running Mac OS X or Windows XP, at a minimum make sure you turn on the built-in firewalls.

If you want to go one step better, ZoneAlarm (free) for Windows and Little Snitch (fee) for Mac OS X add outbound connection monitoring as well.