Ok so if you recognise the critter in this image then your half way to understanding what I'm talking about! Port 70 is traditionally reserved for the Gopher protocol. What is Gopher? Well it's a slim text only layout that pre dates the internet as we know it as (aka HTML)
Gopher started life back in 1991 and lost popularity in the mid 1990's in favour to HTML (port 80) Just recently I have rediscovered Gopher and so have a group of friends (identi.ca, StatusNet)
I'm hosting a Gopher service using Pygopherd. This has the advantage of serving both Gopher & HTML simultaneously. This means that you can point your browser at vk7hse.org:70 and view using HTML then if you have the Overbite plugin installed for your browser you can then switch to Gopher.
Take a look, follow the links and enjoy the world of Gopher!