Winthrop's "Correct Use of Borrowed Information" handout: www.winthrop.edu/english/plagiarism.htm
Annotated bibliography from Lemoyne University's "Electronic Plagiarism Seminar" on scientific plagiarism: http://www.lemoyne.edu/library/plagiarism/scientific_plagiarism_bib.htm
United States Office of Science and Technology Policy's Federal Policy on Research Misconduct: http://www.ostp.gov/html/001207_3.html
Linda Sweeting's comprehensive annotated bibliography on "Professional Ethics for Scientists" from Towson University, retrieved by the Wayback Machine from http://web.archive.org/web/20040217124129/http://www.towson.edu/~sweeting/ethics/ethicbib.htm, Feb. 17, 2004 incarnation
United States Dept. of Health and Human Services' Office of Research Integrity website: http://ori.dhhs.gov/ and its working definition of plagiarism (which is really worth reflecting on): http://ori.hhs.gov/policies/plagiarism.shtml
Shawn G. Clouthier, "Institutionalized plagiarism: honor among thieves remains an impediment to purging misconduct from scientific inquiry." The Scientist 18.15 (August 2, 2004): 8.
A number of great ethics case scenarios to discuss and reflect on: http://www.research.umn.edu/ethics/plagiarism.html
Michael Stroh, "When Science Turns Suspect," Popular Science December 2003 : 29-31 : http://0-search.epnet.com.library.winthrop.edu:80/login.aspx?direct=true&db=aph&an=11383816
R. Ramachandran, "The Physics of Plagiarism," Frontline 19.22 (October 2002) : http://frontlineonnet.com/fl1922/stories/20021108003508400.htm
The Melanoma Research Project's "Plagiarism Project," which has some of the best info you'll find, especially its "Diagnostic Guidelines:" http://www.melresproj.com/download/plagiarism.pdf (Note: I think this was translated from German; at least the syntax would suggest so.)
Mississippi University for Women has some excellent examples of what leads to inadvertent scientific plagiarism and how to avoid it: http://www.muw.edu/sci_math/Plagiarism/Plagiarism-oct-04.htm
Optical Society of America, Editorial Statement on Plagiarism: http://www.osa-jon.org/abstract.cfm?URI=JON-4-3-142
Georgetown University's guide to plagiarism is really well written, and I commend it to you: http://www.georgetown.edu/honor/plagiarism.html
Davidson's Biology Department has a nicely-illustrated web page on avoiding plagiarism in science writing: http://www.bio.davidson.edu/dept/plagiarism.html