MotherReader has announced the dates for the 4th Annual 48-Hour Book Challenge.  The selected weekend is June 5-7, 2009.  To participate, you select 48 hours in that weekend to read books.  There are some small rules about the books you can read, just to keep things on the same level. 

There are winners for most hours committed, most books read, and an honor list for those who read 20 hours or more. 

So how many hours can you read in 48 hours?  And how many reviews will you post?  There will be prizes to win!