>>Anywhere that Canon has pdf's for flash, lenses, etc? <<
Not that I know of. Up to now, Canon Inc. has not provided any PDFs to us for flash units or lenses. We are negotiating with them to bring their policy more into line with the digital camera group.
FYI, up to now, individual sales companies like Canon USA have been posting manuals on their own web sites as mentioned earlier.
However, Canon Inc. is in the process of strengthening their web-based customer support initiatives through a new program called the Web Self-Support System, or WSSS for short. They are already providing an interactive troubleshooting service for compact digital cameras and DSLRs, and the schedule calls for them to assume full responsibility for posting manuals, drivers, and firmware updates later this year. When the schedule is finalized, I will post the information here.
In the meantime, click the link for "Interactive Troubleshooting" on this page if you want to get a feel for the current WSSS offerings:
http://www.powershot.com/ciw/ppg/EOS1D.html