The U.S. Postal Service honors Bill Mauldin and his creations Willie & Joe with this first-class stamp, available March 2010.
And Hank Ketcham's Dennis the Menace gets his own stamp as part of the "Sunday Funnies" pane going on sale in July, along with Mort Walker's most famous creation, and hopefully that's a Dan DeCarlo Archie drawing. (Can anyone knowledgable out there confirm it?)
(Via The Comics Reporter.)