I guess if you are using groups to delegate tasks and the logon is managed centrally, it makes sense. In our company, there is no centrally managed logon scripts. Each division manager their own as they do their SMS server.

This is drifting a little off topic, but we decided to push out SMS through discovery instead of logon script. We control what computers to exclude one of two ways. One way is to add their NetBIOS names to "ExcludeServers" in the SMS_DISCOVERY_DATA_MANAGER key. The other way is to not add the SMS server's account to the local administrators group.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.