Want to use an instant messenger, but you’re on some computer that doesn’t belong to you and you can’t install the right client software?
Then head over to Meebo.com. This is multi-protocol IM client that works on a web page in your browser. No need to install any software at all!
Also, from my tip yesterday about forcing a secure http connection, Meebo is one of the sites that offer this. So make sure you use https://www.meebo.com when you go there.