Especially annoying for us who need to renew it for "free" until February 29th considering the lack of trainings material.
Anyway, I pre-ordered quite a few books but pretty much all release dates are being pushed back so here I thought I compile a list for you who are interested.
Released
Trainsiginal vSphere 5 CBT:
Order here - $397
VMware vSphere 5 Clustering Technical Deepdive ;
Available in various formats / pricesUnreleased
Mastering VMware vSphere 5 :
Amazon, by Scott Lowe - pushed back to October
Professional vSphere 5: Implementation and Management :
Amazon, by John Hales - pushed back to January 2012
Storage Design and Implementation in vSphere 5.0 (VMware Press) :
Amazon, by Mostafa Khalil - pushed back to February 2010
VMware vSphere 5 Administration Instant Reference :
Amazon, by Christopher Kusek - pushed back to December
Your best bet to prepare for the exam really is
1. Download the official documentation (now in Kindle format too)
HERE
2. Download the product and labs, labs, and more labs
HERE
Some details in how to run vSphere 5 nested (vSphere on vSphere), have a look
HERE
Another good resource, with a lot of useful information, is
Yellow-Bricks, run by VMware's very own
Duncan Epping. Or also informative,
NTPRO.nl, run by Eric Sloof.