To twitter from Skype, simply add username ‘twitter4skype’ to your contact list, and message the following (using Shift+Enter for new lines):
/account
username
password
However - I had great trouble turning it off again when I realised every few seconds new tweets started pouring into my window (and so down the side of the screen).
Turning it off again. To turn it on/off, type #on or #off respectively. Use #exit to log out. Now I know, I just need to share it before the next unsuspecting victim has to abandon their account.