A cool website called Sketch Theatre (which features time lapse videos of artists at work) posted their video of the Babytattooville 2009 Art Jam painting session, which ran for about two days and nights.
The early fall brought a spectacular event called Baby Tattooville. It’s organized annually by the publisher of Baby Tattoo books, Bob Self. One weekend and a countless assortment of top talent from the local art scene. This year brought a congregation of James Gurney, Michael Hussar, Audrey Kawasaki, Travis Louie, Molly Crabapple, Elizabeth McGrath, Miss Mindy, Johnny “KMNDZ” Rodriguez, KRK Ryden, Tara McPherson, Gris Grimly, Tim Biskup, Gary Baseman, Yoskay Yamamoto , Nate Frizzell, Luke Chueh, Jeff Soto, Lithium Picnic, and many more.Babytattooville 2009 Art Jam paintingA number of these artists participated in the Art Jam (a 4 x 5 foot canvas, brushes, acrylics, and 24 hours of to collaboratively cover it in their signature styles) this year for the first time this process was captured by the cameras of Sketch Theatre, and you can see the results here!

As an artist myself, and as a sometime cartoonist who's participated in a few "jams" I can now honestly proclaim that I dislike the "jam" format immensely.
Even when done by cartoon greats (Crumb, S. Clay Wilson, Deitch and Spain) the format just seems self (or selves) indulgent and inevitably never satisfies.
A lot of these artsy jams are done for charity which of course is cool, but to see them as something other than kooky collectibles is just weird to me.
Watching a video of a "jam" seems even weirder