Hi ClearTech,
If each client adds your same LiveID as administrator to their account, then you will see all the accounts in the Multi-Account Console when you log in and be able to administer all of them. For more information on the multi-account console here
are two links which may be helpful.
Blog post on the multi-account console -
http://blogs.technet.com/b/windowsintune/archive/2010/08/05/the-windows-intune-multi-account-console.aspx
Multi-account demo from demo showcase -
http://demoshowcasesuite.com/demos/d414fa51-cb70-46c6-a8ec-e34c495b0df0