Skype Email Toolbar - Available for Microsoft Outlook, Outlook Express and Mozilla Thunderbird. You can call Skype Names and phone numbers written in emails or add a Skype Button to your email signature, so other people can just click to call you.
Skype Microsoft Office Toolbar - Place calls and send the file you are currently working on via Skype. The toolbar recognizes phone numbers within your document, turns them into links and lets you call them using SkypeOut or send SMS messages. (Support Excel, Powerpoint and Microsoft Word 2000/XP/2003)
Skype Toolbar for Mozilla Firefox - The Skype Web Toolbar recognises phone numbers and Skype Names on webpages, so that you can call with one click, through Skype.