Since my last poll is pretty dated, I figured it was about time that I re-asked this question. It won't provide a level of skill in each but it will provide a sense of the basic understanding of people for each subject.
Although there are types of modding other than the ones listed, I figured that these are the most predominate and expandable. Let me know if you feel that something should be added.
Here are a couple sample questions if you are looking to give more input: (edits have been made to this for clarity)
-How much experience do you have in a specific category?
-What do you want to learn more about?
-What do you like modding?
-What mod types are you most interested in getting? (one of the categories in the poll)
-What is your favorite mod? (more specific than just DSL unless talking about the GIB work)
I've personally done them all but I prefer to do stuff related to the Arena.py files. On the other hand, I prefer to receive mods that have lots of Arena.gmf work. Out of other people's mods, my favorite is Snow.py because it re-inverted the way that I think about AIing.