Here's a PM modeling tool I put together based on a spreadsheet I found here a few months ago. The only change I made to the original calculation was to show TSB based on the previous day's TSS. After doing this and pasting in data from CPS the PM chart it created was dead on what CPS had so it appears the calculations are spot on. My primary motivation in putting this together was to quickly model data based on the workouts I consider the staple of my training diet. I also use rolling TSS figures to determine when I need to rest so I included that data as well. Finally, as an example I've also attached my first draft for the 2007 build up I have planned.