One of the headaches in finding out the NTFS permissions on files and folders is determining the effective permissions. Files and folders may have permissions explicitly set on them for users and groups and also have implicit/inherited permissions (e.g. users having access or deny to a folder by virtue of their membership in a group or a nested group). Determining the effective permissions is a complex coding task, especially when you take into account the local and other built-in groups.
We have now included this feature in our Admin Report Kit for Windows Enterprise (ARKWE) and this is scheduled for release in a week or so. This has been a long awaited feature for many of our customers and prospects and I am glad that we have addressed it in the upcoming release.