There is a new project @ CodePlex by Tom Shirley, that addresses a very common problem. It's called the Access Checker Web Part , and It's purpose is to allow site administrators to determine what access a particular user has to content within
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Read the complete post at http://blogs.microsoft.co.il/blogs/itaysk/archive/2008/01/28/access-checker-web-part-on-codeplex.aspx