I personally think TaoPhoenix has a pretty useful insight, and it is one I've subnconsciously followed for all of my apps as well. Many apps that are created are something that is easily done in Excel or Access, and as a consequence, they also tend to be apps that have been created a hundred times before in slightly different formats. In only a minority of the cases, these apps actually do something different enough to warrant existing; in the rest of the cases, the Coding Snack guideline of looking for something existing rather than making something new would seem to be a useful one to follow.
But hey, let people contribute what they want! If they have fun with it, and someone else has a use for it.. then that's all that's needed, right?