I often think about little-bitty churches. They have fewer than two dozen in worship and worship might be twice a month or less often. It may be the one thing the congregation does with regularity, and it comes with a mix of pride and anxiety. Of course, I also tend to think of the surviving Christian churches within the Unitarian Universalist Association, and this describes many if not most of them.
Needless to say, there's no hymn resource in print that would suit them well. (The humanist and theologically-mixed ones fare no better.) If I was forced to choose, I'd find a box of the old Beacon Song and Service Book and I wrote (and many commented) about that in 2007.
But that keeps me thinking: what belongs in a selection of hymns like this? Popular, not hard to sing, useful in a variety of settings, perhaps even with an option for guitar chords if the organ (or organist) dies. I'd leave out Christmas hymns -- a particular beast -- for now. Say, what forty hymns would you want easy access to? I have a few in mind, and will list them -- once I distinguish between my own taste and what would be really useful.