I have heard a lot of people mention Code Complete as a book worthwhile reading. Unfortunately, I am so busy that I don't have time to read it, so can anyone tell me what the key points of the book are?
Code Complete is about software craftsmanship; it is an advanced-beginner/intermediate-level book, written for the working programmer, but it would still be very useful to someone who's been programming for at least a year.  

Thus the key points of Code Complete (2nd ed.) are nicely summarized in its Chapter 34, Themes in Software Craftsmanship.  As paraphrased from my notes:


Conquer Complexity: reduce the cognitive load on your mind via discipline, conventions, and abstraction.
Pick Your Process: be conscious of quality from start (requirements) to finish (deployment) and beyond (maintenance).
Write Programs for People First, Computers Second: code readability is hugely important for comprehensibility, review-ability, error-rate, error-correction, modifiability, and the consequent development time and quality.
Program into Your Language, Not in it: think of the What? and Why? before the How?
Focus Your Attention with the Help of Conventions: conventions manage complexity by providing structure where it's needed, so that the ultimate resource - your attention - can be effectively used.
Program in Terms of the Problem Domain: work at the highest level of abstraction possible; top-level code should describe the problem being solved.  Distinguish OS level, programming language level, low-level implementation structures, low-level problem domain terms, and finally, high-level problem-domain terms that would make total sense to the (non-coder) user.
Watch for Falling Rocks: as programming merges art and science, good judgement is vital, including heeding warning signs.
Iterate, Repeatedly, Again and Again: iterate requirements, design, estimates, code, code tuning. 
Thou Shalt Render Software and Religion Asunder: be eclectic and willing to experiment.  Don't be an inflexible zealot, it precludes curiosity and learning.  Go beyond having just a hammer in your toolbox.


But the most important take-aways are in Chapter 33, Personal Character: once you consciously seek to improve as a coder, you can and will.  The fastest way to do so is to take on the the attitudes of master coders (humility, curiosity, intellectual honesty, discipline, creativity), while also practicing their habits (many good habits are listed in the book, e.g. choosing good variable/value names).  

Also, the book makes clear that the gap between average and excellent in software is immense; that fact alone should drive the conscientious coder to better himself.

That's the short of it; the long version is in the book. :)  I can also send you my not-so-long, not-so-short notes if you want more details.  But the book is certainly money and time well-spent, even if the writing style is tiresome at times.  

Beyond Code Complete, I'd highly recommend The Pragmatic Programmer.  It's for intermediate-level programmers, nicely-written and a great mix of high, medium, and low-level advice.
