The most recent novel is a collection of short stories called Harrowing the Dragon. A contemporary fantasy was just released called Solstice Wood.
Something Rich and Strange is was reprinted in October 2005, and Solstice Wood was released in February 2006.
The short story Naming Day is in the collection of stories called Wizards.
There is also a Yahoo Chat group devoted to the discussion of McKillip and her books. Feel free to join us!
And Readerville has a forum on McKillip as well.