This video by Mark Galer’s gives an excellent outline of camera development based on the evolution of Sony cameras. He also gives some indication of where the technology will go in the future.

References

• Mark Galer’s Video on Sony’s development history
• Dave Haynie’s quick summary of the difference between Front-Side Illuminated, Backside Illuminated and 3D stacking Backside Illuminated sensors.
• Canon news of the future of the sensor industry