The reason that my stories aren't all indexed is because of the time it takes - I certainly turn my attention to it when I can, but I can't guarantee it on any regular schedule because of the other demands on my time. In the interim, there's always the option to bookmark stories in your browser, or to create your own index of fics you've enjoyed on delicious (or another archiving application). You'll also find that many people have those indexes, and that by searching delicious for key words you can find the fic you want.