One thing I miss from Windows is that I always had a Skype icon at the bottom of my screen that would tell me when I had new messages. Right now, the Skype icon in the Mac taskbar only lets me click on it to change my online status. Is there an app out there for a better Skype icon or would there be a way to customize it to do what I want? On Windows, it turns gold and there's a number with how many new messages you have.
In the Skype Preferences, under the Notification tab, you can set the Skype icon to bounce, play a sound and display a built-in visual notification when you receive new messages. Click on the "Event" dropdown to select the events you require. Is this the sort of thing you were after?