Would like to see this graph intersected the the size of the project and or pay-scale/budget for the salary/project. Let's not forget, quantity != quality.
This would be a very nifty graph. If SQL = MSSQL/Oracle, then the payscale would probably ranking it higher than the 3 languages above it. (I'm just taking into account all the recuiter emails that Ive seen over the last year...)
