Here are the links to all the excellent papers from VMWare –

• What’s New in VMware vSphere 5.1
• What’s new in VMware vCenter 5.1
• What’s New in VMware vSphere 5.1 – Networking
• What’s New in VMware vSphere 5.1 – Platform
• What’s New in VMware vSphere 5.1 – Storage
• What’s New in VMware vSphere 5.1 – Performance
• Introduction to VMware vSphere Replication
• Introduction to VMware vSphere Data Protection
• What’s new in VMware vSphere Storage Appliance
• What’s new in vCloud Director 5.1