I want a good "what does a LISP programmer need to know about WL?" :-)---or, rather, a nice, conversational tutorial, a "WL for Lisp programmers" that discusses

I want a good "what does a LISP programmer need to know about WL?" :-)---or, rather, a nice, conversational tutorial, a "WL for Lisp programmers" that discusses not just the things you need to know, but the underlying philosophical similarities and differences and the pitfalls you're liable to encounter if you try to make the transition. (I also want an open-source implementation, but it would seem that isn't on the table.)