I want users to be able to browse to a folder
(http://www.something.something/documents) and see a list of files. I
suspect it requires some directive in httpd.conf as well as a .htaccess
file in the folder.

I have added the following to httpd.conf:

<Directory /srv/www/orpweb/documents>
AllowOverride Indexes

This is in addition to the following:

<Directory />
Options None
AllowOverride None
Order deny,allow
Deny from all

My .htaccess file is as follows:

Options +Indexes

My browser error message has changed from "Access Denied" to:

Server error!

The server encountered an internal error and was unable to complete your
request. Either the server is overloaded or there was an error in a CGI

If you think this is a server error, please contact the webmaster.
Error 500

Any ideas?