This site has surveys on where students straight out of their
undergrad and MBA degrees would most like to work:
http://www.universumusa.com/undergraduate.html
http://www.universumusa.com/mba.html

Is there any comparable survey for people who have been in the
workforce for a number of years? I figure, they've got more real world
experience, so perhaps their judgement is better.

Hello Gnu,

Fortune magazine releases annual lists of the best companies in the
United States for which to work.

The list is put together by the Great Place to Work Institute in San
Francisco, California, which surveys random samples of employees from
companies to get their opinions about their workplaces.


100 Best Companies to Work For 2005
Fortune?s annual ranking of companies that rate high with employees.
http://www.fortune.com/fortune/bestcompanies?promoid=cnnmoney


The 100 Best Companies to Work For 2005 is available for free at Great
Place to Work Institute USA.

100 Best Companies to Work for in America 2005

Wegmans Food Markets
W. L. Gore
Republic Bancorp
Genentech
Xilinx
J. M. Smucker
S. C. Johnson & Son
Griffin Hospital
Alston & Bird
Vision Service Plan
Starbucks
Quicken Loans
Adobe Systems
CDW Corporation
Container Store

Great Place to Work® Institute USA
The List Publisher's Site: Fortune Magazine

See the complete list here:
http://www.greatplacetowork.ie/best/list-bestusa-2005.htm


The rankings from previous years are available at the links below.


100 Best Companies to Work for in America 2004
http://www.greatplacetowork.ie/best/list-bestusa-2004.htm


100 Best Companies to Work for in America 2003
http://www.greatplacetowork.ie/best/list-bestusa-2003.htm


100 Best Companies to Work for in America 2002
http://www.greatplacetowork.ie/best/list-bestusa-2002.htm


Search terms used: 
Ranking best companies by employees

I hope this is helpful.

Best regards,
Bobbie7