Stitching scanned images if your originals are too large
for your scanner.
DoubleTake is the "nano" of stitching software. Drag &
drop your images onto or into DoubleTake, arrange them, and
check the overlaps. When you are done - save and perhaps copy
and paste the result to iPhoto.
DoubleTake is simple enough to not require a manual, but a
few annotated screen shots highlight a
few main points.