I've been tracing Yahoo! imagery in Potlatch for a while now, and have really gotten the hang of Potlatch. I'd like to get into JOSM, but find the interface has a bit of a learning curve (just like Potlatch). It might be my connection, but I find I have to keep pressing the "data wasn't updated" warning icon in Potlatch, and it gets very annoying. I don't have a GPS yet, so it's tracing all the way.

I have successfully setup JOSM and downloaded an area. Also worked out how to get Yahoo! imagery through Firefox.
The problem is, I can't seem to get JOSM to remember the background Y! image between sessions. This is annoying since I do little bits at a time, and would prefer to come back and continue editing without needed to download the Y! images again...