While you may not want to rely on statistics and polls for the entire content of your speech, these can be a great way to back up the information you share with others.
Provides links to the "Top 100 Speeches," "Movie Speeches," "Christian Rhetoric," "Rhetoric of 9-11," etc. You can also visit this site for general info on rhetoric.
If you're thinking of doing a speech on something related to politics, but are looking for a non-partisan representation on an issue, you may want to use this site!
If you want to do a speech on a topic related to new media - usage of cell phones by a certain age cohort, social networking Web site trends, etc., this is a great site to use! It's got statistics, firsthand research, etc.
"The Pew Research Center for the People & the Press is an independent, non-partisan public opinion research organization that studies attitudes toward politics, the press and public policy issues."