I'd be interested in a HowTo as well.
I have it up and working but would like to lock it down / limit access in some situations. Searching Apple's website gives no advice regarding configuration nor definitions of the default terms "Users" "Administrators" "Everyone" and the corresponding permissions.
If anyone has a HowTo or a configuration manual, it would be most greatly appreciated.
Other than my own lack of knowledge... Back to My Mac has been a terrific new feature.