Sorry, I meant to answer this post earlier, and your post in the General forum thread on play-via-internet reminded me of this. Since it's a specific question on a software matter, I think it's more appropriate to answer here.
My experience with screenmonkey is limited. I used it succesfully twice when I was "experimenting" with it, but then when I tried to use it for a real game, I couldn't make my game public. The fact that it's a for-profit thing is making me steer towards MapTool. It's not that the good folks at screenmonkey don't have the right to charge money for their product, it's just the way I choose (not) to spend my money.