The Favorites Tracker is a program that I originally created for myself in order to have any easy way to know when chapters have been added to fan fiction stories that I am interested in. In addition to emailing you when chapters are added, it can also act sort of like a status monitor you can look at to quickly find out which of your favorites have had new chapters added to them. I liked this tool so much that I thought I would make it available to everyone, so here it is. I should note that this site is a work in progress, so if you have any ideas please let me know.
So far, the following fan fiction sites are supported: