iMessage2Skype is an application that allows you to forward iMessages to your Skype account. You have to set up a second account for Skype and login with this on the machine you are dedicating to message forwarding. Also, you can remotely activate and deactivate the forwarding, just by replying "SET ON" or "SET OFF" or get the forwarding status by sending "STATUS".
Mia for Gmail (was Notifier Pro for Gmail) is a desktop Gmail client which sits politely in your menu bar.
