These don't use scroll margins:
Just to clarify a bit what I meant by saying "somehow depedent" (notice the quotes). Sure, you can use spaces to position your text but it's ugly (code-wise) and it lacks of scrolling for long text (a pretty good reason for me NOT to use album art). So what I was trying to say actually is that whenever album art will be supported officially and you will be able to place an album cover within a WPS, there should also be a way to position the text, too.
Hypothetically speaking, having an album art patch ready to be implemented into CVS, a good idea maybe, would be to implement scrolling margins, too and use this until viewports are ready.
Generally, I wouldn't like things getting in CVS and planned to be removed afterwards but in this case, we have already tons of WPS that use scroll margins and when the implementation of viewports will come, they are going to be outdated anyway.