Off and on they have been doing puppet sketches at the Homestar Runner site.
Normally they do flash animations, but someone created puppets for them, and they have been having fun in the real world.
Here is the latest example:
http://www.homestarrunner.com/dangeresquePS1.htmlI love how they kept the 3-D Homestar a 2-D character by putting both of his eyes on one side of his face still!