In December 2010 I started a project with a few friends to make life for network engineers in the Netherlands better.
I noticed that there are a lot of friendly 'shell access' exchange deals between dutch network operators. This makes it easier for parties to debug network issues and troubleshoot from the outside. A point of view outside your network is absolutely essential, seeing what others see is a useful thing for a variety of network problems. Well known examples are "it works for even numbered ip address, but not for odd numbered ip address via this and this route".
The NLNOG RING tries to do this in a more organized way, basically the deal is "donate 1 machine, and gain access to all other machines in the ring". So far already 10 organisations are participating.
How useful is the ring exactly? A very nice example is executing a traceroute from ten different autonomous systems: nlnog ring example.
More information about the NLNOG RING can be found on the website we've launched today: ring.nlnog.net.