david-
You can get what you need with the core REPORTS module (or any of several third party modules including some free ones).  However, you need to supply the right SQL query for the data you desire.
 
To see a basic info list of all users on a site, drop the REPORTS module on a page and, in the module SETTINGS, add the following SQL query:
 
select * from users u
inner join userportals usp
on u.userid = usp.userid
where usp.portalid = @portalID
 
Easy enough, but you probably don't want to show who is a SuperUser, who has their password set to force an update on next login (UpdatePassword), etc.
 
Let's say you only wanted to show names, usernames and email addresses.  For that, use the following query:
 
select 
FirstName+' '+LastName as Name,
Username as Username,
Email as Email
from users u
inner join userportals usp
on u.userid = usp.userid
where usp.portalid = @portalID

If you wanted to show other user data not included in the USERS and USERPORTAL tables, you'd need additional "join" clauses with the appropriate tables.  For instance, you could join with the appropriate Blog module table to show whether a user has a blog or join with the appropriate Forums module table to show how many forum postings each user has submitted.  Creating your own queries in this manner is very powerful (and free).  The down side is that you need to know what database tables hold what info and know how to create the proper queries to extract the desired data.
 
You might also be interested in these (relatively) simple examples which can readily be used in the REPORTS module by substituting REPORTS module tokens (such as "@portalID") in place of the custom module tokens (such as "[PortalID]") shown in the examples:
 
   Free DNN Module:  Advanced Datagrid Part 1 (create list of most recent user signups)
   http://www.eguanasolutions.com/DNN_Blog/EntryID/2.aspx
 
   Free DNN Module:   Advanced Datagrid Part 2 (add an events"status table" for the DNN EVENTS module)
   http://www.eguanasolutions.com/DNN_Blog/EntryID/5.aspx
 
   Free DNN Module:  Advanced Datagrid Part 3 (create a clickable "most-commented blogs" list)
   http://www.eguanasolutions.com/DNN_Blog/EntryID/13.aspx

   Free DNN Module:  SQLView (sort EVENTS module events by City / County / State)
   http://www.eguanasolutions.com/DNN_Blog/EntryID/15.aspx
 
   Quickly create a Tag Cloud with the REPORTS module
   http://www.eguanasolutions.com/DNN_Blog/EntryID/33.aspx
 

Cheers!
-mamlin

David,

check out free UserDirectory module  it allows list and detail view, search, filter and a couple of other features.