Heat limited running pace

I have just released a calculator that shows the maximum paces that can be run at given temperatures and humidities. You can see an example chart and some details of the calculations at http://fellrnr.com/wiki/Heat_limited_running_pace or you can fill in your height and weight at http://fellrnr.com/wiki/VDOT_Calculator to generate a chart customized for you. I will be making a few tweaks in near future, both to the algorithm and to reference the research that the calculator is based on. I'm also intending to create other calculators based on the same mathematical model. Let me know what you think.