I'm working on quite a big map atm. When it's done it will be printed on a large poster, so I get to have a lot of detail. At some point in time I will use it for a fantasy setting I'm also working on, but right now I just enjoy working on it.
I'm working in photoshop and atm most of my layers are just sketch layers reminding me where I want mountains, forests, plains, deserts and so on. I've also put on current and climate zones. It just made it easier for me to get my jungles and desert the right places. I plan on doing the world one continent at a time, so I've included a zoomed in version on the area I'm working on right now.
As a reference here are some links to the brushes I'm using. The map wouldn't be that nice without them.