This page has links to sites that will give you ideas for debate topics to use with your students.
Debate Central and Freespeaker are 2 US professional debate sites with case topics, links and resources.
http://www.freespeaker.org
http://www.debate-central.org
Japan Debate Association is the home page of the Japan Debate Association, the organization promoting debate activities in Japan.
http://www.kt.rim.or.jp/~jda/
History Channel is an archive of historical speeches in English with transcripts.
http://www.historychannel.com/speeches/
Michigan University offers reference and instructional tools on governments, political science, statistical data and news.
http://www.lib.umich.edu/govdocs/
Abacon is an instructional site for public speaking provided by Pearson Publishers and written by someone at Northern Virginia Community College.
http://www.abacon.com/pubspeak/index.html