Plus add the ability to search/filter posts by software version ranges. It's good practice to add this information in the text of the initial post, but not everyone supplies the information in a standard format. This list refers to the same software:
ArcGIS Desktop 9.3.1 SP1
ArcEditor 9.3.1 service pack 1
When searching for a solution to a problem it's sometimes helpful to limit searches to specific software version.