For those who aren’t sure how to tackle creating an S5 presentation, I’ve put a basic primer online. In addition to explaining the basics of an S5 presentation, it links to a ZIP archive of a “blank” presentation, so you can use that as the basis for any presentations you create.
I’m planning to write in the near future a short guide on how to switch themes. It isn’t quite as simple as it first sounds, mostly because of the possibility that an author would create a theme package containing only the files that need to be replaced, instead of everything that usually goes in the ui/ directory.
Like it says at the end of the primer, let me know if anything’s missing or unclear.