Jon Hall posted this info on the VMTN Communities which I wanted to share with you guys.
VMware will be providing onsite testing services at VMworld 2009. A great deal is available on the VCP exam (see my post at http://communities.vmware.com/thread/222191?tstart=0 ), but more importantly, the VCDX Enterprise Administration and Design Exams will be offered! You must be pre-authorized to take these exams, so if you are already in process to take the Enterprise Administration Exam, contact email@example.com to inquire about the availability of the exam at VMworld. You can register at Pearson VUE for the Design Exam, but again you must already be in process and have authorization from VMware to take the exam. The link for registering with Pearson for the Design Exam is http://pearsonvue.com/vmware/vmworld/ . For the Enterprise Administration Exam only, you must contact us directly.
For those who want to do the Enterprise Exam check the mock exam that has also has just been released: Enterprise Administration Mock Exam.
Dave Convery also posted about discounts for these exams, which might be a nice incentive to get you guys studying!