The ESV people at crossway have done a great job at tagging a professionally-read audiobook version of the ESV. They have it tagged verse-by-verse so that when you are accessing their online text, the specific verse range you want will be read.
I'm wondering if Logos can work with ESV to bring this functionality to Logos4. I would be a very cool and useful feature.
By the way. ESV recently wrote about an improvement to their audio backend: http://www.esv.org/blog/2009/11/new-improved-esv-audio-back-end/