Added link to my Jekyll plugin: https://github.com/snaptortoise/jekyll-pinboard-plugin. Interfaces with the Pinboard API to make data for specified tags available to the template, sort of similar to the built-in Data Files support.
Update history to reflect merge of #5514
Oops — looks like there was a typo in my commit. It's missing a bracket. I can submit a patch later tonight unless someone wants to step in and fix it.
@georgemandis I'm on it, my mistake, should have seen this while reviewing it.