Upcoming title match.

Due out this month (or next month?):

Shades of grey 

Due out in June 2010:

Shades of gray 

The Fforde is on my RIGHT AFTER THE CYBILS pile (which is achieving epic proportions).  He and I have a pretty hit-or-miss relationship, but I generally always at least give his new ones a try.  I'm not familiar with the Kessler/Kittredge title, though I believe that it's the second in a series.