Here are the tour dates that have been announced so far for the upcoming U.S. dates the melvins and Jello will be doing, supposedly melvins will do a set then take a break and they will come back out with Jello and play some more, not sure if that is gospel though.  I also am not sure if that is a final list of dates.
10/21/2005     Middle East Club     Boston, MA
10/22/2005     Pearl Street     Northampton, MA
10/23/2005     Webster Hall     New York, NY
10/25/2005     Black Cat     Washington, DC
10/26/2005     First Unitarian Church     Philadelphia, PA
10/31/2005     Great American Music Hall     San Francisco, CA
11/02/2005     Neumo's Crystal Ball Reading Room     Seattle, WA
11/03/2005     Croatian Cultural Center     Vancouver, BC
11/04/2005     Crystal Ballroom     Portland, OR
11/05/2005     Capitol Theater     Olympia, WA
11/07/2005     WOW Hall     Eugene, OR
11/08/2005     Kate Buchanan Hall     Arcata, CA
11/09/2005     Boardwalk     Sacramento, CA
11/16/2005     Henry Fonda Theatre     Los Angeles, CA

There are good reports coming back about the show last night in England where they played the entire Houdini album, check the message board to read them.  Here is the flyer...