Hacking Digital Cameras (ExtremeTech)
This book is the only one of its kind that
I have found on the market.
It has lots of both easy and more advanced
DIY camera hack instructions that may be
usefull for the experimental photographer.
Some chapters might seam outdated since
the nature of the digital camera is to have
unlike the analog ones, a very short life cycle
but there is also hacks of a more timeless
nature like lens and camera flash hacks.
The book is also a source of inspiration that
can lead you to find other things and ways
to modify and build your own equipment.
Free sample pages here [PDF Download]