Does anyone know of a 40K glossary or list of commonly used terms? I've read a lot of Black Library books and know the basics but I thought a comprehensive list of terms would be nice to go over with new players.

On a side note I'd like to try my hand at some 40K style short stories so something like this would be of immense help in the writing department!

I second everything, since I'm in the same need of inspiration (and charts are usefull)

Lexicanum is about as good as it gets for what you're looking for. It doesn't really have the short stories but all the terminology and much of the knowledge required can be located there.