I've just found out the best feature about skype's messaging system. In recent version of skype you can edit old messages using the mouse and a right click on the timestamp of the message - that's boring an slowwwwwwwwww.
Today I wanted to correct muself, as I tend to be unable to write anything properly in any chat window I'm involved in and did it irc style using :
s/lov/love/
after typing enter I did not see a new message as I expected , but my previous message was edited and the mistake corrected. That is so cool.
oh ! and why did you want to type love ? ;)