Integrating VIX API into vSphere API is a great decision VMware made for its vSphere 5.0 release. Instead of working on two separate APIs, you now have one to deal with. It also solves the portability issue of VIX APIs which is tied to a specific platform – VIX has three versions for Windows, 32-bit Linux, and 64-bit Linux.
My company has created products like vSearch ("Super vCenter"), vijavaNG APIs, EAM APIs, ICE tool. We also help clients with virtualization and cloud computing on customized development, training. Should you, or someone you know, need these products and services, please feel free to contact me: steve __AT__ doublecloud.org.
Me: Steve Jin, VMware vExpert who authored the VMware VI and vSphere SDK by Prentice Hall, and created the de factor open source vSphere Java API while working at VMware engineering. Companies like Cisco, EMC, NetApp, HP, Dell, VMware, are among the users of the API and other tools I developed for their products, internal IT orchestration, and test automation.