This may be more a server admin topic, but since there isn't one for Leopard Server I'll mention it here.
Yes, many have noticed (and some with great joy) that NetInfo is no longer part of the client OS (it's been gone from the server for a while). Most notably, NetInfo Manager is gone, replaced by Directory Utility, advanced settings in the Accounts System Preference (right-click on a user to see it), and some command line tools. The root account can be enabled from Directory Utility or use dsenableroot from the command line.
The main point of this hint is that all the ni* command line tools are gone, too. If you have written scripts to e.g. create a new user using the ni* tools, now is the time to rewrite them using dscl and other related tools:
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20071031001139197