OGR is my preferred magazine, but I do enjoy reading both OGR and CTT. I also read MR, Garden Railways and N-Scale. All of these last three MR, GR, and N-Scale magazines have feature in each issue of some type of electronics project that could be used with our hobby. MR is mostly DCC, GR has quite a variety as does N-Scale. I think I have been the most impressed with the N-Scale articles by Bob Kendall, who I believe has been doing these articles for them for quite some time. I have only read a few issues of N-Scale, so I can't be certain of this, but he has had an article in every issue in the last year or so.
Something like this is one thing I would like to see in OGR. Command control and electronics are becoming a big part of our hobby. Many in this thread have mentioned wiring, lighting and other things as potential subjects for articles. I think this would be a good addition to OGR and I know I would enjoy something like this in each issue and I think others would as well.
This is also my personal preference and I realize everyone else will have a different personal preference for what they would like to see and no one magazine can have everything for everyone in every issue.