[cestith]

The semantic data format people have had a point all along. Just because digital audiobooks are inspired by books on cassette is no reason the data format can't support all sorts of metadata. We could have a format for written and read aloud works that highlights every word in the text on a screen as it's read when used in the proper player software, with user notations, bookmarks, indexes, an completely searchable by full text.

[jfengel]

Kindle supports this with Whispersync. I don't know how the file format works.