What are the best practices for writing maintainable CSS?

Question

I am just starting to explore this area and wonder what are the best practices when it comes to production of clean, well-structured and maintainable CSSes.

There seems

Answer 1

For me it's good to alphabetize properties of element. It is simple, visible and good for programmer's eye :)

e.g.

#my-id 
{
   color: #fff;
   float: left;
   font-weight:
   height: 200px;
   margin: 0;
   padding: 0;
   width: 150px;
}

Before production it's recommended to use some of the css compressors to provide gains in performance.