Funny you should mention me...I just got my internet back on after three months
Aside from the most awesome map by Kal, of Mystara, on my garage wall, I also have large maps I put together of...
1 Toril. I have posters of the first map from the grey boxed set, the map from The Forgotten Realms Atlas, and the map from 3rd edition.
2 Krynn. I have all of the Tasslehoff map pouch poster maps. Pre and Post Cataclysm.
3 Athas. I have a cloth map of the Tablelands that came in one of the boxed sets.
4 Star Frontiers. I have a large map of the frontier.
5 Hyboria. A map of the lands of Conan.
I have several large area maps of Mystara. The Known World, Savage Coast, Etc.
Splitting maps up with Adobe is easy. I set the margins to overlap about a quarter inch so my large maps fit together nicely.