I like the approach of drawing volume lines over the graph. It does make reading off the compressor map quite simple.
Most places I've seen on the 'net explain how to size the compressor. What I don't get is how to size the turbine + exhaust housing, and have it matched to the compressor.
A few things that might not have been clear in your explaination:
1) The iso-lines are lines of equal efficiency.
2) The thick curves are lines of equal turbo shaft RPM
3) The left-most line is usually marked as the surge point of the turbo
A few suggestions:
1) Some of us have sigs disabled, so you might like to post a link.
2) You might consider using a colour with more contrast. At first I though "that's a weird looking map", then I figured out that you'd added stuff.
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