This message comes from Puppeteers of America member, Elise Handelmann:

Ventriloquist Week on Latenight with David Letterman - Sept 18-22!
Jay Johnson, Ronn Lucas, Jeff Dunham & Todd Olivor will each be
featured on the show all week long with their puppets!

http://www.cbs.com/latenight/lateshow/

Here's a link to ventriloquist Jay Johnson's "The Two & Only" Broadway show

http://www.nytimes.com/2006/09/17/theater/17gree.html?ex=1158552000&en=55e45525ad92