If I have Fusion running, and am in my Leopard window, iChat tells me I have no camera (iMac, 2.4, 20"). I have to reboot and not start Fusion to get the camera back. Any ideas, folks?
Check the little USB icons in the right bottom corner of Fusion (glowing blue means its connected to the VM, click it and select "disconnect"). You have iSight connected to the Fusion VM, thats why you can't use it in Leopard.