Don't know if anyone is interested or not, but I got bored this afternoon and wrote a simple calculator to figure out your 1RM etc. when you input how much you lifted and how many reps on a given lift.
The percentages I used are based on my own experiments. So it's not perfect science, but it works for me. I'm doing Waterbury's TBT right now and I wrote this to help me figure out how to adjust the weights with each workout as the reps change.
A zip file can be downloaded here:
Just unzip the two files (exe and dll) into a folder together.
Here's a screenshot of what it looks like: