Ingrid Daubechies asks on Math 2.0:

Suppose most mathematical research papers were freely accessible online.Suppose a well-organized platform existed where responsible users could write comments on any paper […]

Would this be, or evolve into, a useful tool for mathematical research? What features would be necessary, useful, or to-be-avoided-at-all-costs?

This is not a rhetorical question: a committee of the National Research Council is looking into what could be built on top of a World Digital Math Library, to make it even more useful to the mathematical community than having all the materials available. This study is being funded by the Sloan Foundation.

There’s good stuff in the comments, especially here and here. I’ve said before that having comments on papers is not my highest priority, and I can think of other improvements on a comparable scale (significant, but without overhauling the whole system) that would add more value. So, in case anyone is interested and for future reference, here’s my take on a few specific issues that seem to come up again and again. In this post, I’ll stick to relatively small stuff, generally of the kind that could be set up initially by, say, NRC without much help from the community, as per the question I started with. There are of course bigger fish to fry, from the creation of new journals to rethinking funding mechanisms for science. But that’s for another time.