Gl.ib.ly

Flash apps have cookies and they don't disappear when you clear your browser cookies. In the terminal type the following:

ls ~/Library/Preferences/Macromedia/Flash\ Player/#SharedObjects/*/

Surprised? You'll probably see a long list of sites you haven't visited anytime recently. To remove these creepy cookies do a:

rm -r ~/Library/Preferences/Macromedia/Flash\ Player/#SharedObjects/*/

The paranoid among you might want to create a script with a line like the following in there:

find ~/Library/Preferences/Macromedia/Flash\ Player/#SharedObjects/*/ -type d -mtime +7 -exec rm -r {} \;

This can be added to your daily cron task and will delete any cookie directories older than 7 days.