Thomas, I just found a screen capture Chrome extension that will actually scroll down to capture an entire SoundCloud playlist, (rather than just capturing the immediate viewport like most screen-capture apps do). However it will not work (scroll down) on Napster playlists for some reason. And user reviews indicate that it doesn’t work on other sites as well. Anyway, I’m just passing it along to you since we hit on the issue of losing one’s playlists. It’s called “Full Page Screen Capture”.