What's the meaning of this icon that appears over the adium icon?
It looks like corners of a black square (or four triangles) spinning around a circle.
What's it trying to say?
Inside the Adium.app bundle, that icon (and two more like it, with the black square rotated) are called Connect1.png, Connect2.png, and Connect3.png. I'm guessing it means Adium is having trouble connecting to a chat service.