Thank you for the replies. It occured to me that the 'Activity' web part already included as part of the site performs the basic functionality I am after: a way for users coming to the site to be aware of what has changed recently.
However, it doesn't seem to be working quite as expected or configured. I can configure how many recent activities to display. But, no matter what value I input (>4), it only ever displays at most the last 4 activities/changes. If I change it to < 3, it displays that number of items, but it will not display more than 4. Am I missing something?