Yup, +1 for digsby. Can connect to all major IM and social networking services including yahoo, google, windows live, facebook, twitter and linked etc. One thing that i like about it is that, apart from being one stop shop for all communication needs, it can be docked to one side of screen like the vista sidebar and can autohide. Plus it shows email headers for yahoo, gmail and windows live and you can do basic tasks like deleting mails you dont want to read right from the tray icons of every account. Many a times i dont have to login into my emails as i delete the spam and unwanted ones from it. Another good feature is its update system, it checks for them every startup and if there is any, silently downloads and installs them without any user intervention. And updates too are progressive, only 100-900Kb each time. So its hassel free and always updated. i have switched to it completly for last 2 months and didn't had any problem till now.