Your Winning Edge from New York State Dept. of Labor
Includes tips for successful interviews, resumes and cover letters.  Also has sample resumes and cover letters.
http://nycareerzone.org/framegrabber.jsp?http://www.labor.state.ny.us/workforceindustrydata/publications/winning_edge/winnedge_index.shtm

About:  Job Searching:  Resume and Cover Letter Guide
Links to many sources with pointers on how to write resumes and cover letters.  Also contains links to many sample resources.
http://jobsearch.about.com/library/resume/blIndex.htm

University of Wisconsin:  Career Development Center:  Resumes and Cover Letters
http://www.uwm.edu/Dept/CDC/jobsearch_preparation_resume.html

Montana State University:  Career Services & Student Employment:  Tips on Resume Writing, Interview Skills, and Job Hunting Techniques
http://www.montana.edu/careers/students/tips.htm

AGU Resume Guide - By Peter Fiske
Useful lists of action verbs for resumes.
http://www.agu.org/sci_soc/resumeguide.html