NT comes with builtin hidden admin shares. For background see Hidden Admin Shares. User shares can be hidden also. Simply add the $ sign to the end of the share name. If you do hide user shares and you are using %username% as the sharename, you will have a problem with your logon scripts. The syntax

net use z: \\homeserver\%username% will have to be changed to

net use z: \\homeserver\%username%$.

No big deal but a problem if you have logon scripts and you change to hidden user shares.

Of course, if the sharenames are userids, hidding them is not a particularly strong security measure.

Highly recommended.