My friend Giscard posted about code reuse and I couldn't agree more.  Interesting thing to notice is that developers thrash a lot more when they are working on one-off tasks than regular projects.  Developers tend to believe that they would minimize the efforts spent on one-off tasks by just using ad-hoc solutions and not even thinking about standards and best practices.  What they do not realize is that they still end up thrashing a lot since they usually re-create solutions from scratch and go through same debugging cycle (probably more) that the developer of already existing solution have gone through.  Also, when they are asked to work on similar one-off tasks later on, whatever work that was done for previous one-off task cannot be reused.  Vicious cycle...

Think reuse even if your code has only 5 lines...