www.wetfeet.com

Wow. Way better info than most job boards (Monster, HotJobs, etc). This site includes a vast amount of "insider" info on a huge assortment of companies, including interviews with company recruiters, tips on what they are looking for in a candidate, and forums where jobseekers post their experiences at specific companies. Also includes all kinds of guides for interviews, negotiating, etc.

www.salary.com

The best salary lookup and comparison site I have seen. You give it your zip code and choose from various job descriptions to get an accurate range. Has separate base salary and total cash compensation amounts.

This is another salary comparison tool:

jobsmart.org/tools/salary/index.htm

And here's a salary differential calculator:

site-www2.homefair.com/calc/salcalc.html