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In vSphere 4.1, several properties and types have been deprecated. The following table from vSphere Web Services SDK 4.1 release note lists each deprecated API element and its replacement.

Name of deprecated type, method, or property	As of vSphere API 4.1, use instead…
Methods
PropertyCollector.CheckForUpdates	PropertyCollector.WaitForUpdatesEx
PropertyCollector.RetrieveProperties	PropertyCollector.RetrievePropertiesEx
PropertyCollector.WaitForUpdates	PropertyCollector.WaitForUpdatesEx
VirtualMachine.AcquireMksTicket	VirtualMachine.AcquireTicket
Data Objects
VirtualMachineMksTicket	VirtualMachineTicket
Data Object Properties
ClusterVmToolsMonitoringSettings.enabled	ClusterVmToolsMonitoringSettings.vmMonitoring
HostCapability.replayUnsupportedReason	HostCapability.replayCompatibilityIssues
VirtualDisk.shares	StorageIOAllocationInfo.shares
VirtualMachineRuntimeInfo.memoryOverhead	PerformanceManager memory overhead counter

Note that the release note has much more information that you should really read through if you use vSphere 4.1 API.