I would be also interested to see some good answers on this topic. I have pretty much the same background as you. I am trying to more design myself, before doin

I would be also interested to see some good answers on this topic. I have pretty much the same background as you. I am trying to more design myself, before doing mostly web development - Java before now mostly Django. I recently switched to Mac. I am wondering if anyone has any suggestion on some good free tools on OS X? GCV, hope you don't mind me adding this comment here. Cheers, Tomas