Didnt see this posted, so here it is -
http://www.vmware.com/files/pdf/vsphere/VMware-vSphere-Platform-Whats-New.pdfvSphere 5.5 nuggets: vCenter Server Appliance limitations lifted!
The book's on pre-order at Amazon >
Announcing Mastering VMware vSphere 5.5
Some decent enhancements, and much greater in number than what they did with 5.1. Dont understand why they didnt club 5.1 along with 5.5, perhaps they didnt want to introduce too big a change in one hit or something. App HA, 62TB vmdk's, Windows 2012 clusters and the storage enhancements are interesting. My company was thinking of moving to 5.1 soon, now I think we'll hold off and go 5.5 instead (once the new version has been out a few months).