iPhone/iPod application “LDAPeople” allows your iPod or iPhone to search an LDAP server for contact information, which you can save in your contacts with a single button press. It fills the gap that Apple left in Mail for the iPod with system software os2.x (3.0 includes LDAP support, but not for ssh ldap connections, which LDAPeople supports). LDAPeople has a great, clean, implementation. I highly recommend the application if you’re on the fence about buying it. I use it frequently at my university.
The only barrier to using LDAP people is that, depending on your institution, you have to struggle through proper settings to ensure that you can utilize your organization’s LDAP server to the fullest. The latest update for LDAP people has made a great addition- the import and export of settings files! This is fantastic.
So, without further ado, here’s my settings file for the University of Illinois at Urbana-Champaign’s main LDAP server: UIUC LDAP People Config File. Note that you can search by First name, Last name, and UID/UIN with these settings. The UID is also listed in parentheses after the person’s name to aid in finding the right student or staff-member based upon their e-mail address, etc.
If you make any changes to the settings, I’d love it if you could post below, allowing me to update the file and benefit the rest of the UIUC community. Thank you!
To see other reviews of LDAPeople and/or purchase it, see this app on iTunes: 
Related post: iPod Touch Application: LDAPeople