"A failure to properly structure your files (whether physical or electronic) can have legal implications. For example, if you fail to maintain a clear demarcation between the open and closed source work that you do, the code from one area may contaminate the other, potentially leading to untold heartache. Indeed, this applies pairwise to any two projects you are working on. Particularly important is that you maintain a strict demarcation between any of your personal coding infrastructure (eg common libraries that you may have developed and reuse for multiple clients) and the specific projects you are working on."
