It’s more than one year that the virtualization community waits to puts its hands on the first 3rd party virtual switch for VMware Infrastructure. At that time Cisco was reported as the networking provider but the company never confirmed.
Finally, at VMworld 2008, Cisco and VMware unveiled such piece of software, called Nexus 1000V, but so far nobody gave a precise release schedule.
Now trusted sources informs us that Cisco will start the Nexus 1000V beta program in December.
VMware Infrastructure 4.0 beta testers will be able to join even but it’s not clear if this will be a public beta or not (probably not considering that VI 4 beta itself is private).