In the past two weeks, I have been sharing the same Skype tip a couple of time. I thought it might be interesting to have it in written somewhere so that maybe additional people get to learn it.
One of the great thing that Skype chat allows is editing messages that you have written. It is quite convenient when one makes an error while typing and wants to correct it. It can also be used to completely delete the message (if you wrote to the wrong person for instance).