The following sites will be helpful in detecting plagiarized works.

Eve2 - $29.99 for unlimited use

Glatt Plagiarism Services - three different software programs to help deter and detect plagiarism

Google - get relevant results fast from searching more than 3 billion web pages

Plagiarism.org  - an online resource for educators

Plagiarism Resource Site - use this FREE software to detect plagiarism

Turnitin - the world's leading plagiarism prevention system

World Wide Web Research Tools - choose a search engine and type in suspected phrases

Be aware of what's available to the students.

Essaymart.com - search and preview excerpts for free before purchasing

Fast Papers.com - all students pay one low rate for FAST HELP

Internet Paper Mills - a vast variety of UNBELIEVABLE Internet resources to tempt your students

Internet Subject Specific Paper Mills - this list represents the newest trend in term paper sites

Questia.com - the World's largest online library of topics