Turn off Vista's UAC on an Application by Application Basis

Microsoft Support - How to disable the User Account Control Prompt for certain application (KB946932)

"Sometimes, you want to disable UAC prompt for certain application on a Windows Vista computer. You do not want to disable UAC for the whole computer.

Resolution

Using the tool and steps below, you may disable UAC prompt for the specific application. This does not disable the User Acount Control feature for the whole computer.

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Another tool for your Vista utility belt... Disable UAC, i.e. force a given application to Run As Invoker without UAC prompting, by using the Microsoft Application Compatibility Toolkit v5.0 to create an "Application Fix."

It's not hard, but not for the novice either...

(via John Robbins' Blog - How to Disable the UAC Prompt for a Specific Application)