The VMware knowledge base contains some useful articles regarding the new vSphere 4.1 release.
- Using Tech Support Mode in ESXi 4.1
- Troubleshooting ESXi 4.1 Scripted Install errors
- Recreate vSphere 4.0 lockdown mode behavior in vSphere 4.1
- vCenter Server 4.1 fails to install or upgrade with the error: This installation package is not supported by this processor type
- Migrating to the vCenter Server 4.1 database
- Update Manager 4.1 patch repository features
- Lockdown mode configuration after upgrading from ESXi 4.0 to 4.1
- Changes to VMware Support Options in vSphere 4.1
- Securing Credentials in vMA 4.1
- Overview of Active Directory integration in ESX 4.1 and ESXi 4.1
- ALUA parameters in the output of ESX/ESXi 4.1 commands
- USB support for ESX/ESXi 4.1
