Amen. This is something I continue to work on – I want the written and spoken word to be my "secret" weapon when going up against people smarter and more talented than me.
Paul Graham writes:
I think it’s far more important to write well than most people realize. Writing doesn’t just communicate ideas; it generates them. If you’re bad at writing and don’t like to do it, you’ll miss out on most of the ideas writing would have generated.
Jason Fried writes this:
If you are trying to decide between a few people to fill your position, always hire the better writer. I don’t care if that person is a designer, programmer, marketer, salesperson, whatever. Assuming your candidates are fairly equally skilled and qualified overall, always hire the better writer. This is especially true with designers since copywriting is interface design.