About the field:

CSR "industry profile" from the Fletcher School 

Job Search websites: 

Business for Social Responsibility jobs page  - this site posts only a few jobs per week, but they are uniformly great CSR jobs; most are geared toward middle-managers.

Idealist.org - has many jobs, but relatively unfiltered for their relevance 

Acre - for sustainability-related jobs in the UK

Canadian Business for Social Responsibility (CBSR_ 

More (from CBSR): 

www.ccbriefing.co.uk/pages/jobs.php
www.charitypeople.com
www.charitypeople.co.uk
www.countryside-jobs.com
www.csreurope.org/jobs/default.aspx
http://deventjobs.tripod.com
www.eldis.org
www.eds.co.uk/jobs
www.environmentdaily.com/opps/index.cfm?action=detail&id=17068
www.ethicalcorp.com
www.ethicalperformance.com
www.fundraising.co.uk/jobs.php
www.greenbiz.com/jobs
www.jobsgopublic.com
www.lifeworth.com
www.net-impact.org/index.php?jobs
www.conferencehouse.co.uk/nfpjobs/subscribe.htm
www.oneworld.net
www.oneworld.nl
http://peopleandplanet.org/ethicalcareers
www.peoplemanagement.co.uk
www.personneltoday.co.uk
www.sustainability.com/people/associates/student-tips.asp
www.sustainablebusiness.com/jobs/ethc_jobs.cfm
http://sdgateway.net/jobs
www.totaljobs.com