This is an addon based on AlphaMap, by Jeromy Walsh, when AlphaMap was still very.. lean. Basically this is a very old version of AlphaMap, from which Gatherer support has been stripped, leaving just the transparent click-through map.
I've been using it for quite a while now, but thought I'd share it seeing how AlphaMap has died and other addons such as Mapster are starting to appear, to fill in the void.
And yes, I am aware the Interface version in the TOC is old, but I won't update this just for that, as it works fine otherwise.
Furthermore, I won't update this at all, so bug-reports and feature-requests will go unanswered I fear.
And last but not least, I did not upload a screenshot, as this is just a transparent world-map, without the borders/close-button/etc. I think most people know of AlphaMap, so they'll know what this looks like.
Have a nice day and to those who might use this - enjoy