Cost-of-living comparisons for different areas of the country:

http://www.homefair.com/homefair/servlet/ActionServlet?pid=27&cid=homefair

http://www.bestplaces.net/

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-Salary Calculator: 

http://www.homefair.com/homefair/servlet/ActionServlet?pid=116&previousPage=199&cid=homefair&fromState=WA&toState=RI

 Also:

http://www.bestplaces.net/col/colresults.aspx?Lcity=7600&Rcity=6480&salary=

Salary Wizard:

http://swz.salary.com/salarywizard/layoutscripts/swzl_titleselect.asp?narrowdesc=Engineering&narrowcode=EN01&zipcode=98109&metrocode=163&x=36&y=5