In my last update on virtualization for Datamation last winter, I looked at developments toward the end of 2010 concerning virtual desktops and improvements to virtual infrastructure. The past six months have seen increasing sophistication in both areas, with new products from the major virtualization vendors and some interesting twists, which I’ve noted in my story for them this week here. I review where Microsoft, Xen and VMware have been with recent new products and acquisitions and identify a few trends.