The following Applescript will show a selectable, scrollable list of machine accounts in OD, then show which ComputerGroup(s) that computer belongs to. This is a quick way to confirm membership without having to open WorkGroup Manager, and especially handy to allow your techs to verify without being a directory admin in OD.
John DeTroye has updated his T&T doc which has always been a great best practices guide to client management. It covers subjects such as Open Directory, setting up accounts, managed client settings (MCX) and ARD. You can get the doc from here.