[Adoby]

I do the same, and I don't use calibre to find what to read. Instead I use the browsing capabilities in Mantano Premium. And I have all my (good) books ready to read on my Xoom. Currently about 3500 books in about 8GB.

One argument against folders based on genre is that many books can be assigned to several genres. Tags are better that way.

Calibre is my main storage for books. I also have several backups. Before import to calibre. The calibre library itself, in several generations. The books stored on my xoom.

I "only" use calibre to very carefully fix metadata on new books, and then connect calibre to a folder and send copies of the new books there. Also I use a custom column with "main genre" to create subfolders for genres. The folder is shared over wifi and can be accessed by my Xoom.

On my Xoom I run the app "Folder Sync" to automatically update a copy of this folder on my Xoom. Since only changed or new books have to be copied a sync is very fast. I have set Folder Sync to try to sync every hour, but only if my Xoom is charging. Usually my xoom is charging when I am working on the computer, so normally the sync is fully automatic.

After a sync I have to import the new books to Mantano. The books are imported "in situ", so no new copies are made on the Xoom. I also create "Collections" in Mantano based on the subfolders for main genres.

Mantano also allows you to easily browse the books using the tags, titles, series, author and so on. Almost as good as calibre itself.

It all works fine for me, but it is not perfect. Any changes to errors in metadata has to be fixed in calibre, and the book has to be manually reimported to Mantano after the next sync.

Also it would have been nice to be able to automatically map tags to collections in Mantano using some form of logic:

Historical Crime = Fiction and (Crime or Sleuth or Detective or Police or "private investigator") and (Historic or Historical) and not Fantasy