It's amazing how following good coding standards can make bugs go away. If anyone disagrees, I would suggest reading Joel Spolsky's article "Making Wrong Code Look Wrong": http://www.joelonsoftware.com/articles/Wrong.html That article changed my perspective on coding standards.

To your PSA, I would like to add: Never use the '!' operator at the beginning of a conditional. It's too easy to miss when reviewing or changing code, especially next to certain characters:

    if(!llama) {
        ...
    }

This is a tiny bit more text, and so much safer for maintainers:

    if(llama == false) {
        ...
    }