[edlucas]

Just to add another link to the pile, the most useful database I've found of base salaries for comparison is the publicly available H1B data. You should account for the costs to the company of sponsorship in addition to the base.

The data is available down to the company and title: http://www.h1bdata.info/

[chimeracoder]

That's a good source, but last time that link was posted on HN, someone pointed out that there's a downward bias in that data, because on top of the costs of sponsorship, companies may still end up paying the employee more than what they state in the initial application.

[mathattack]

Yes - they also miss bonuses, equity, and "I think we can pay less to get someone from overseas".