The 1910 edition of Mark Twain's Speeches is online at:
http://marktwain.miningco.com/library/speeches/bl_contents.htm

There are also some great resources on his lecture tours online at
Stephen Railton's Mark Twain and His Times site:

Mark Twain On Stage
http://etext.virginia.edu/railton/onstage/onstgehp.html

Jim Zwick