Canon is the only source for a printed manual, because the manual is copyrighted.
Here is a place to start contacting Canon:
I've lost or misplaced my Canon Powershot G11 manual. Anyone know whether - and where- I can buy a replacement please?
I do have a copy of it on my computer but that's no help out in the field.
I'd also be interested in getting in touch with anyone using a G11 to share ideas and best usage, etc.