Group Policy Log Viewer for Server 2008

Microsoft provide a tool for analysing event log entries for group policy.
This tool is listed at for Windows Vista but works just fine on 2008 R2.

Download the tool from
Group Policy Log Viewer Download

This is a MSI installer that adds a the GPLOGVIEW.exe to your machine.

Running GPLOGVIEW.exe /?
gives a list of the command syntax and examples.

A common command is to output to a HTML file
 gplogview.exe -h -o GPEvents.html