How do I show a list of internal contacts on a Sharepoint page?

"Answering my own question...

Site Users web part

This web part will show a list of one of:

people and groups with direct permissions on the site
people in the site's member group
people in any named group

So I could create a new user group (with no specific permssions), add relevant users to it, and display that in a Site Users web part. However the out-of-the-box Site Users web part displays names (linked to profiles) but no other information, such as job title.

Custom list

Or I could create a custom list with a column holding 'Person or Group' information, which can optionally be set to (a) limit selection to people only and/or (b) members of a particular group, and then display that list in a web part on the page."