Recently I've run into a lot of bots hitting my websites and eating bandwidth and wanted to share some potential techniques to lower the amount of bandwidth used by these email harvester and junk bots.

Bot Trap
http://danielwebb.us/software/bot-trap/

Basically it puts an invisible image that bots automatically click (they hit everything trying to find emails and such) and then it bans them using .htaccess. Seems like a great idea to save some bandwidth.

Another .htaccess mod that may save bandwidth is
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/javascript

Using that line in .htaccess file, though it could cause some issues with some servers and browsers. Requires mod_deflate.

Hope those help :)