I am reading The Pragmatic Programmer, From Journeyman To Master. It seems to be a nice book. In the first chapter it is talking about software entropy. Basically if the software has some parts that are buggy (of course you dont write code that has bugs), it will spread out to other parts too till the whole software is rot.
According to the book, Broken Window is a theorem, that New York Police Department used to clean the streets. Basically the idea is, if there is a street and some of the windows are broken, and you don fix those, people start littering. They start thinking that the street is abandoned, and not secure any more, so if u have broken windows left unrepaired, u ll see more crime, graffitis etc. How does this apply to software? If you have buggy codes left in your application, it wont be secure any more, and it will be more and more buggy, crime is going to go up :).
If you have a bug in the code, fix it. I know rapid shipping sometimes will stop you fixing all the bugs, but then remove the feature that your bug is in. Dont let broken windows to be spreaded around, dont let other developers (including urself) think that your code is abandoned.
Have fun coding