MapRoulette is wondrous in many ways but has three issues. First, if you're using an online editor, the time taken to open each task is significant - around 3-5s to open a new instance of iD for each task. Second, that online editor has to be iD, so it's not suited for those of us who use P2. Third, the process for creating your own tasks is fairly cumbersome, especially if you're working on a small series of tasks to be completed by one or a few people.
Potlatch 2 now implements a fast, light way of moving through a series of tasks. It's intended for small-scale personal work rather than planet-sized challenges. There's no 'resolve' button - it's just a way of moving between locations efficiently.
It works like this:
Create (or find) a GPX or GeoJSON file containing the locations.
If it's a GPX file, it should contain waypoints. Each one can have a description in a <desc>, <cmt>, or <sym> element.
If it's a GeoJSON file, it should contain Point features. Each one can have a description in the 'name' property (or, failing that, the first property).
Open it in Potlatch 2 with the Tasks button.
You can either load a file from disk, or type a URL and click 'Fetch URL'. (For the latter, note that the usual nonsense about needing a crossdomain.xml file at the root of the server applies, sadly.)
Move from task to task with the palette.
The map will centre on the first location. When you want to go onto the next one, click the forward arrow. To go to the previous one, click the back arrow. And that's it.
Try it for yourself using a GPX file of waypoints. If you don't have one to hand, these files from the Adventure Cycling Association of long-distance cycle routes across the US are fun.
I'd be interested to hear of other formats this could support, and further suggestions for improvement; and it would be lovely if authors of other editors were also interested in exploring the idea.