So I knocked up a ruby script that takes an indesign file from our design house and exports it to Baker-ready html. Our design guys were providing a single indesign doc, with alternate layouts for portrait and landscape orientation, and the script folds them all into a Baker style layout, whilst making sure that no resources are duplicated to save on file size. I added some CSS3 media query goodness to switch between the two layouts as the device is rotated.
Now that we have a proper Baker5 export, I'll probably use that instead, but I think I'm going to still need some post-processing to support those alternate layouts; I can see In5 supports Baker+liquid layout, but I can't see anything for alternate layouts?
Additionally our design guys have switched to one indesign file per article, so the entire publication now comes as about 20 ind files, which is a bit of a headache...