Hi,
This is my first post here, though I've been a long fan of your magazine, back from when it was called Dungeon. I'm not a native English speaker, so pardon any mistakes I might make.
I love what you guys are doing with the Pathfinder Adventure Path: the quality of the products and support is amazing!
As I'm very happy with the Adventure Paths so far, I was considering also to buy some of your modules, but there are a lot of them and I'm slightly confused.
So, do the code letters in the Modules (i.e., D1, D2, E1, J1, etc.) give an indication of what to expect from the module? I guess at least they might be related if they share the same letter but... is there some other relation between modules?