I'm downloading now and I'll let you know what I find. I'm more curious/hopeful that calibre will be updated to support this.
Update
OK, I've updated. From with My Documents (and My B&N Library) you have a new option for Shelves. Tapping that gives you the option to:
- Go to shelf
- Place on or remove from shelf
- Reorder shelves
- Create a new shelf
- Remove a shelf
- Rename a shelf
The process then is to Create a new shelf, then highlight a book, and Place it on a shelf. Unfortunately I don't see the shelves appearing when looking at my nook's file system on my Mac, so it would be a tedious process of shelving books through the nook itself.