Take a look at http://www.webmin.com for information about Webmin, a web-based administration tool for Unix systems. It can handle Unix users, LDAP client configuration, LDAP server configuration, LDAP user administration, and a great deal of other things. Here's a list of standard plugins.

Webmin happens to be almost entirely in Perl. Even if you don't use it or it doesn't fit your needs exactly, it could serve as an example or a starting point. It's been years since I've used it and longer since I've looked at the source, so I can't say how good of an example it is for style. It does work, though, and many people around the world use it.