The last few weeks I made the time to read Clean Code by Robert C. "Uncle Bob" Martin. It's loaded with small and big tips and advice on how to improve the readability of your code and why this is important. Recommended reading for programmers of all levels.

A quote:

I am not expecting you to be able to write clean and elegant programs in one pass. If we have learned anything over the last couple of decades, it is that programming is a craft more than it is a science. To write clean code, you must first write dirty code and then clean it.
This should not be a surprise to you. We learned this truth in grade school when our teachers tried (usually in vain) to get us to write rough drafts of our compositions. The process, they told us, was that we should write a rough draft, then a second draft, then several subsequent drafts until we had our final version. Writing clean compositions, they tried to tell us, is a matter of successive refinement.
Most freshman programmers (like most grade-schoolers) don’t follow this advice particularly well. They believe that the primary goal is to get the program working. Once it’s “working,” they move on to the next task, leaving the “working” program in whatever state they finally got it to “work.” Most seasoned programmers know that this is professional suicide.