The Skype Email Toolbar. Beta toolbar which looks quite useful. Install it into an email client like Outlook Express or Thunderbird and email messages become IM and presence enabled. And you can call them too while reading their messages.
* Call Skype Names and phone numbers written in emails * See when your contacts are online * Start instant messaging in follow up to emails * Add a Skype Button to your email signature, so other people can just click to call you.