Tutorialzine have created an Ajax Chat script which you can use on your site for free. The best point is that it fetches the profile picture from Gravatar websites. In this web 2.0 world where most of the users have a gravatar picture, this free Ajax chat script can be very useful for wordpress blogs and websites to give the incoming user a platform to interact. It is one of the best open source chat script I have ever seen written in php and mysql.
