Yeah, that's a great book for learning. I also like Don Silver's book.
http://www.amazon.com/Complete-Guide-Kitchen-Design-Cooking/dp/0932767095 If a kitchen doesn't work well for it's primary use, then it doesn't work. Even in this day and age of dueling microwaves for meal preparation, looking at the whole as distinct zones is very helpful.
Also, nothing beats having a mentor in the field to help you. If you don't have that on the job, you've got a hard road ahead. 20/20 isn't that friendly, and it crashes. They do have training courses in it available, and I would insist on having your employer pay for one of them. Also, talk to your cabinet company reps. Many of them are former designers and can give you plenty of tips and tricks once you've got a working knowledge of how to lay out a floor plan.
Join the NKBA. If your employer is a member, it's only $50. If you have to join as a sole member, it's worth it for the contacts. Attend meetings and network. Use the streaming training they have on site. They have lots of courses that you can pay for that will help you. Study the NKBA guidelines and memorize them. Buy the books and bore yourself to sleep every night reading a couple of chapters.
Read online forums in your "spare" time until your eyes bleed. The best kitchen forum on the web is at GardenWeb. It's consumer based, so you'll learn a lot about what your customer expect from you. But, for someone who needs a quick course in kitchen design, it will really help you if you can soak it up.
Don't be afraid to learn from your mistakes! We all did, and still do, if we're honest. There's always something new to know, either because of something we've missed in our education over the years, or because a cabinet line is trying something new. If you aren't someone who's excited about having the opportunity to always reach to more and more, then you've entered the wrong field!