Virtual Earth: Calculate Distance of User-Drawn Polyline

A couple days ago I posted some code to "Calculate Distance Between Geocodes in C# and JavaScript", so today I decided to post a small sample program that shows a more "real world" example of puting that code to use. Here's a small program I wrote (in pure HTML and JavaScript) that allows the user to draw a polyline, and it automatically calculates the total distance between the points being plotted.