You will need to attend an official vSphere course such as vSphere: What's New, in order to qualify for the VCP4 certification: http://vmwaretraining.blogspot.com/2010/01/current-paths-to-vcp4.html
You'll find loads of other useful VCP4 posts on my blog too, have a browse around
Thank you Scott. Seems It woud better for me to go for VCP 310 coz i have already got authorised training for ESX3.5
How to become a VMware Certified Professional on vSphere 4 (VCP4)
There are four possible paths to achieve VCP4
If you are NEW to VMware
Take and pass the VCP4 exam
If you are currently a VCP3
VCP3s must attend the VMware vSphere 4: What’s New two day
instructor-led class in order to upgrade.
Take and Pass the VCP4 exam.
If you are currently a VCP2
VCP2s who have not upgraded are required to attend the VMware
vSphere: Install, Configure, Manage; VMware vSphere: Fast Track OR
VMware vSphere: Troubleshooting course
Take and pass the VCP4 exam.
If you are not a VCP3, but have attended one of the prerequisite
classes (VI3: Install & Configure; VI3: Deploy Secure &
Analyze; or VI3: Fast Track).
Attend the VMware vSphere4: What’s New two day instructor-led course.
Take and pass the VCP4 Exam.
Welcome to the Forums - VCP 310 is no longer available - your only option is to obtain a VCP 4 -
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unfortunately your course is not valid for the 410 course you will need to sit the 2 day whats new course.
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Tom Howarth VCP / vExpert
VMware Communities User Moderator
Contributing author on "[VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment|http://www.amazon.co.uk/VMware-VSphere-Virtual-Infrastructure-Security/dp/0137158009/ref=sr_1_1?ie=UTF8&s=books&qid=1256146240&sr=1-1]”.
Contributing author on "[VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410|http://www.amazon.co.uk/VMware-Certified-Professional-VSphere-Study/dp/0470569611]”.