I have had to set up my printer (Canon i560) using a BJC 7000 driver (which works - thanks to whoever suggested it). I also want drivers for a Canon Canoscan 5000F scanner and a Canon Powershot S40 camera.
Is there some source of Canon drivers anywhere?
(I have sent a message to Canon as well)

There is a free driver project for the Canon 5000F scanner here. I'm not sure how it goes, but it's worth a try. This scanner is listed as unsupported on the Sane Homepage.

Baldrick

Canon scanners have some of the worst support in Linux because Canon itself doesn't seem interested in supporting it. The basic models have been reverse engineered, but the ones with advanced features like the 5000F are just too complicated to deconstruct. I have 5000F myself that I've been sitting on for 2 years now without support. The only info I've been able to find is the link provided above and a page by someone else in the same boat we are.

I don't know about the camera, but you may be in the same boat. However, most cameras act as simple bulk storage devices when attached to a computer, so you may be able to set it up in the same way as you would a USB card reader.