Power users tend to place the most demands on IT. They want to run every report at the same time in different windows, and complain when they don't perform with Google-like speeds. Report Designer is one tool where you may want to place limits on your users, to ensure that they don't go blowing up the memory in your SQL Server 2008 install.
Resource Governor is the way to go here...
First thing we want to do is to limit the amount of CPU resources ad hoc queries can consume. Let’s say we do not want ad hoc queries to consume more than 20% of CPU cycles and no more than 15% of available memory if there are other workloads running. To do this, we need to create a resource pool, place the ad hoc group in that resource pool and set limits on that pool.
2007 November archive at SQL Server 2008 Application Compatibility Blog
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