Hi,
I passed my exam last week! My score was an 81, but I have only been using ESX for a few months and I can't say I spent much time studying. What I can say is that if I did not read the PDF's listed below, there is no way I would have passed. My personal opinion is that if you are worried about passing the test, and looking around for other study material that might help you, don't waste your time or money. All you need to do is commit to studying the PDF's VMware provides and you will be prepared.
Configuration Maximums for VMware Infrastructure 3
Basic System Administration
Resource Management Guide
Fibre Channel SAN Configuration Guide
iSCSI SAN Configuration Guide
Virtual Machine Backup Guide
ESX Server 3 Configuration Guide (Did not read, but I am sure would have been helpful )
Materials from Virtual Infrastructure 3 Install and Configure class (Did not review my class materials. I personally don't think is necessary if you are studying the PDF's above)