Attached Link: http://www.konfabulator.com/

Looks great. The Tracer option would be very useful. As I understand it it is a floating image on top of the Carrara interface. Does this mean the user can adjust the transparency of the image? Quartz in Jaguar (Mac OS 10.2) should allow for that. Konfabulator.com has a very cool XML/javascript program that would allow to create "Widgets" for this sort of thing if you can get it to run on top of the Carrara UI.