I've read the inner champion and while some of it is written for a younger age group than me (ie not adult), it's well written and explains the concepts well. And I've actually found a few tit bits of advice which help.
The key one for me is that it explains that the adrenaline from being nervous is the same adrenaline from being excited, but your brain is just processing the chemical differently. If you can change your mindset to accept that the buzz is excitement and not fear then you can control yourself while performing. I can now be heard at competition saying I'm not nervous, I'm excited or reminding myself that I don't get nervous for the Christmas show so why is competing any different. It's all a show after all. This has really helped me get my nerves in check, so I'm really glad I read the book.
I figure if you can take one piece of information away from it, then it's worthwhile.