One thing I wouldn't do is try to keep a live list of this data on the admin page, as it would put a lot of MySQL queries out there. Admin has option of leaving a live window open, and be offline.
Could it be setup exactly the same in layout as the Transcripts page? Not something that is available in the monitor area.
A list of host names (or nickname if supplied), with each name being a link to their visitor detail/history would be great.