Hiding the member's list from guests will help reduce server load, database queries, abuse by human spammers that use the Members List and stalkers. Originally posted in the Resource Archives. ragtek granted me permission to repost as I needed this to hide my members list after installing Search by Custom Field by akinak. Here is an archived template modification by Brogan if you don't wish to install the addon. A related resource is Remove Members List.
This resource is unsupported.
Upload everything from the "upload" directory into your forum directory
install ragtek Hide Memberlist for Guests_1.1_b_2_en-US.xml