With every major ESX release someone figures out how to install that release inside VMware’s Workstation product. The process these days has gotten far, far easier; however, just knowing that it can be done (and how!) is useful for demoing and evaluating VMware’s new software.
In doing some searching myself this morning, I discovered this video with the step-by-step. Enjoy!
More tips? More tricks? Click over to http://www.windowsitpro.com/categories/category/Virtualization/GregShieldsonVirtualization.aspx!