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I was surprised to discover NetInfo Manager missing from Leopard. According to Apple Support:

NetInfo Manager is not included with Mac OS X 10.5 Leopard. You can use the command line utility dscl to perform some advanced functions formerly covered by NetInfo Manager. … For example, you can use dscl to add or remove users from system groups such as “admin”.

To enable the root account or change the root password in Leopard, Apple recommends using the application Directory Utility, which can be found in the Utilities folder in Applications.

Unlike previous versions of Mac OS X, which used NetInfo for locally defined hostnames, Leopard appears to use /etc/hosts .