A few resources:
Mass Deployment of the Microsoft Dynamics AX Client: https://mbs.microsoft.com/customersource/documentation/whitepapers/daxwp_massdeploymentoftheaxclient.htm
*Note this is for general review of mass deployments and is not specific to AX 2009
Silent installation – http://msdn.microsoft.com/en-us/library/aa496627.aspx
One important note regarding syntax
For upgrading existing clients:
…\Setup.exe LogDir=C:\log HideUI=1 AcceptLicenseTerms=1 LicenseTermsVersion=en-us UpgradeClientUI=
For Installing new clients:
…\Setup.exe LogDir=C:\log HideUI=1 AcceptLicenseTerms=1 LicenseTermsVersion=en-us InstallClientUI=