Do you know of any others we should include here?
They must be free and offer a good, reliable service without excessive advertising.
If you do, then please drop us a line at email@example.com
MSN MSN Messenger Service allows you to chat to people around the corner or around the world - in real time! It also gives you the ability to send free SMS messages. It only takes about 3 minutes to download on a 56K modem.
ICQ ICQ is one of the original message services, offering free online chat, free SMS messages and a variety of other useful functions. You can even use it to receive SMS messages in your e-mail!