...and downloaded JOSM. So far I'm finding it a bit on the meh side. I'm using it primarily to add relations to the RTC network and a few other tasks (turning multiple-node intersection in a single one is a doozie with Merge node). Mostly I find it unintuitive and slightly overcrowded, and having to download the data constantly because you're running out of the original area is annoying, plus it does some simple tasks (primarily moving on the map) in ways radically different from Potlatch, and some tasks you would think would be simplified by it (why isn't there a "Duplicate relation" tool??) are barely so.