The overview map is down for the time being, sorry :(
(I needed storage space on this server for a university project, and can't fit both the project, and the map into 10Gig)
To create a marker, place a sign anywhere in the world, and put
[POI] at the start of the text. The marker will show up
the next time the map is rendered.
For the time being I'm fine with covering the hosting costs on my own. However, if you feel like contributing, you can send me money.