Keeping up with the Leopard-centric changes to managed preferences and mobile accounts is crucial if you're responsible for a labful or campus-ful of Macs, and you want to gracefully control what permissions or resources your wanton users have when they log in. One great resource for Mac admins diving into MCX (managed clients for OS X) for the first (or hundredth) time is Apple engineer John DeTroye's Tips & Tricks documentation.
We mentioned John's Tiger edition of the T&T docs last year, and now that he's updated the handbook for Mac OS X 10.5 and Server 10.5, you'll want to bring your library up to date. Gone is most of the material specific to machine imaging techniques (I strongly recommend NetInstall [PDF], which is working better under Leopard than it ever did before), making room for more discussion of MCX settings and portable home directories. Download your free copy of the T&T file today and it'll make your life easier tomorrow.