I've written before about the last few little jobs on a remodelling project and how they seem to take a disproportionate amount of time. Some call it the 80/20 rule, others refer to it as the "short strokes". One of the reasons the little jobs seem to drag on is because they're easy to forget. A nick in the paint on a railing in the basement is certainly not top of the list for your general contractor ... if it's on a list at all.
I've discussed the use of lists before. On my iPhone I use the standard Reminders app. Very basic, but at least things are written down. Thankfully, the folks at SmartTools have come up with a great little app called Punchlists. Punchlists allows you to photograph whatever it is that needs to go on your list, add some text describing it, and then take the entire list and email it to the trades who need to finish up.
PunchLists is available for iPhone and iPad (sorry Android users) for $4.99.