Well it wasn’t release as in go install it, 30 days from now, you should see a download available. But you can check out the official VMware website for more information.
You can also check out the official Simulcast featuring VMware CEO Paul Maritz here.
A must read is the VMware vSphere Upgrade Center if your looking to upgrade asap. Check it out here.
If you would like to get a quick comparison of the different licensed features with each edition check out the VMware vSphere Editions Comparison Chart here.
ThinApp was also featured today and it looks pretty cool. The packaging process and deployment of applications were made to look a breeze. Check it out here. Or download and test it for yourself, go here.
Lots of things to look forward to with the release of vSphere(ESX 4.0)