Just a few things that I know I would like to read about...

Toning/bleaching
mounting, matting and framing
Website design
Submitting to galleries, competitions
Portfolio management/presentation
Camera building/repair
Adventures in photography?
etc.

If you consider that you have expertise, or even a passing knowledge in a subject area, consider writing up a few words and tacking on a couple of pictures. (Make Chris and David work really hard.)

Cheers,