For the true camera techno-freak, Canon Manuals is a Web site that stocks "Parts Catalog" documents for almost all Canon cameras and accessories (there is none for the S1iS). The manuals are all PDF files.
I downloaded the manual for my now defunct Canon G1, and it turned out to be a 23-page black-white document with exploded parts views of every aspect of the camera, along with balloon tags identifying the parts. Every little screw and bracket and component is shown in isometric views.
I learned that the flash and the speaker are one unit. The last couple of pages list the service tools; curiously, no screw drivers are listed. And the last page shows the location of two fuses. Some Canon camera owners find that their camera stops working suddenly: it could be that a fuse has blown.
Parts are classified, such as consumables and standard. Another classification is more interesting -- frequency of use -- high, middle, or low. I wonder what that means: does "high" frequency of use mean the part is more likely to wear out?