Contact sheets are the easiest and fastest way to catalogue the film you shoot. All you need is one contact sheet per roll of film. Obviously with digital you tend to shoot many more pictures than what you need, whereas with film you make them count.
The image above is a typical contact sheet of mine. Notice the lettering at the bottom. This how I name and file everything, by format, type and roll number. So in this instance the 120 stands for medium format film. The V100 stands for Velvia 100 and the R3 suggests this is the third roll I have taken.
Adobe Photoshop CS2 has an excellent inbuilt automated contact sheet creator (plug-in for later versions).