On a side note, at least in Norway, every publicly traded company has to file a yearly earnings report, with income and expenses. Seeing how much is spent on salaries, divide by the number of employees, and at least you know if you're paid above or below average (just remember to allow for certain tax expenses the employer pays as "part" of the salary, I suspect that would be different in most countries).

Not feasible (or meaningful) if you work for IBM, maybe -- but for a smallish company that should work. If you can't do that math, you probably shouldn't be doing software engineering either...