In Sharepoint 2007, there was a link to All People which was very practical and allowed you to handle security.
In 2010 the link is gone. Microsoft didn’t think it was useful, but we did…
There is – of course – a workaround to get the same list :
Click on a link to a group in your site and replace the MembershipGroupId with 0.
“http://<siteUrl>/_layouts/people.aspx?MembershipGroupId=116″ should become
And it lists all the users in your organization.
Happy workarounding !