humble, flash in sigs is done easily. contact me if you need to find out how.
I am currently using the Flash Logo hack, or whatever it is called now. been so long since I installed it, that I forget what it was called. We have also been using flash in our sigs for quite a while now.
All I am waiting for is to find out the code for changing the buttons to flash. I am not a flash guru by any means, and I can't offer much flash support, but flash sigs I can help you out with!