The last new episode was - "Carnal Knowledge" - 2/2/09
There has been a lot of confusion on when the next new episode is to air, so I think this is finally it -
The next new episode "The Age of Dissodance" doesn't air until March 16, 2009.
March 23rd - "The Grandfather"
March 30th - "Remains of the J"
April 20th - "Seder Anything"
April 27th - "Loose Ends"
May 4th - TBA
May 11th - TBA
May 18th - TBA