This might be a little bit of a niche trick, but it works well for me. I have been using a site called 3x3links for many years now. It allows you to create a 3 by 3 grid of links (with pictures). The URL can be freely shared and there are no sharing options that restrict access. As an added bonus you can authenticate using a GMail login.
This could be useful for both internal and customer focused sites. Here is one that I use as an example:
http://www.3x3links.com/servicestatus
This could be useful for both internal and customer focused sites. Here is one that I use as an example:
http://www.3x3links.com/servicestatus