Howdy Eli,
I can see an issue in terms of the target for your columns and the likely level of photographic experience of your readership. Speaking for my self, I don't want or need more in the way of "beginner digital photography" columns, and I think a large proportion of the readership here is probably in a similar position.
I would like to see articles about things like balancing gels on strobes and available light, or using coloUr correction gels on wideangles when shooting near the surface (I'll put in a plug for Craig Jones and/or Alex Mustard here, you should ask them for something...). This is an area that would be of interest to advanced photographers and is relevant to shooting large sharks in shallow water, where strobes don't do the job.
But... the article I just summarized above is probably not going to satisfy someone who is just wondering about getting into digital photography, should they go "prosumer" or dSLR, that sort of thing. These people may be interested in articles about just how much you can actually do with a lower end digital camera, as well as the pitfalls of shutterlag.
I would like to see articles about good shark diving/shooting locations, from the perspective of a travelling photographer. How hard is it to get to Durban, what is the water like off the Guadalupe islands, can you by DVD-R's in the Solomons and do you need a voltage adaptor. Those sorts of things.
Hope this gives you some ideas.