Instructables user DHagen was sick of feeding coins into a public copy machine, wanted quality copies, but didn't want to spend much cash to get his own photocopier or scanner, so he did what any DIYer with a digital camera would do.
He built his own DIY photocopier/scanner using less than $US20 of material (mostly plexiglass and a few various nuts and bolts). After building the camera mount apparatus, DHagen details how he snaps, crops,and converts the picture to PDF, but we'd recommend skipping that hassle altogether and using a previously mentioned photo-to-document tool like Qipit or scanR to accomplish similar results with less work on your part.
If you've gone the DIY scanner route in the past, let's hear how happy you've been with the results in the comments.
Portable, Paperless, Digital Copy Machine [Instructables]