Just in steps:
1. Create a (Friends List) ->
http://www.facebook.com/friends/2. Add all your Friends in this group.
3. Goto ->
http://www.facebook.com/privacy/?view=profile4. At the "Friends" section click "Edit Custom Settings".
5. The custom settings window will appear, select your (Friends List) under the section "Except These People" (by clicking the textbox then choose your list using the right icon).