You can start looking at VCP. :
Becoming a VMware Certified Professional (VCP) is your first step
toward gaining expertise in virtual infrastructure and the industry
recognition that follows. This certification is designed to teach you
what you need to successfully install, manage and deploy VMware vSphere
4. A VMware authorized instructor-led course is required.
thread moved to VCP: VMware Certified Professional Community.
Welcoem to the Forums - as Athlon indicated attendance in a certified VMware class is required for certification - the base level is the VCP - this will provide you the information on what is required - http://mylearn.vmware.com/mgrReg/plan.cfm?plan=12457&ui=www
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VMware vSphere: Install, Configure and Manage 4-day training would get you started. It costs US$ 2995. There is at least one class every month in Sydney. If you can't get company grants, "Mastering VMware vSphere 4" by Scott Lowe is a very good book to read.
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