This tip from listener, Ramsey C.:
Being an audiobook site you may already be aware of this, but newer versions of iTunes (above 5 I believe) will modify MP3 files to “Remember playback position” for playback on iPods. The iPod will pick up where you left off, even if you’ve switched over to another book or music. This feature can be enabled by right-clicking a track and choosing:
Get Info > Options > Remember playback position
This is a feature found in purchased audiobooks, but users listening to MP3 books from free sites like yours could benefit from this tip and make listening even more of a joy!