First four that came to mind for me:
Al Pacino in
Any Given Sunday- "Inches"
http://youtube.com/watch?v=9rFx6OFooCs&feature=related
Hugo Weaving in
V For Vendetta- "Introduction by Alliteration"
http://youtube.com/watch?v=uW6HbZXI9Y0
Denzel Washington in
Remember the Titans- "Gettysburg"
http://video.google.com/videoplay?do...arch&plindex=0
Bill Pullman in
Independence Day- "Mankind"
http://www.youtube.com/watch?v=oRGUqd_M6Mg