It’s shame that something as simple as drawing basic shapes in still such a chore in VE — even this solution requires a bunch of code. Google Earth has them beat badly on this front, but they continue to make progress.
Update 6/14/07: These drawing tools were already in VE – they were just hard to find. You have to “add pushpin”, and then change it to a poly. This is simply UI tools for drawing for the dev community.