Thank you. And to answer, there were several steps involved in making those maps:
1. I used a program called "Wilbur" that I found on the net (years ago now, actually, and I don't remember the URL, sorry - though I may be able to find it for anyone interested) to generate fractal landscapes. I did that over and over until I had a bunch I liked. These formed the basis for the landmasses.
2. Photoshop from here on out. Using the magic wand tool, I selected vast swatches of "land," then made new layers of trees, jungles, desert, and whatever else I felt I wanted. Each layer was then erased down to leave the amount of trees/desert/whatever that you see on the maps.
3. Again, in layers, I added political boundaries, city/country/landmark names, city markers, etc.
The PSD files for each piece of land ends up being about 55 MB in size, due to all the layers. Yikes! But the JPG versions are much more manageable, yeah?
BTW, yes, I am someone who's very skilled with Photoshop. I'm a Graphic Artist by trade. ;-)