Hearing Text, Not Tunes, on Your MP3 Player

Cool article by David Pogue in the NY Times about software that converts text into speech and encodes as MP3. Pretty cool stuff for accessibility purposes and just for being able to hear dictated text on the go (like books on tape/cd). Maybe this will resurrect the e-book. Even cooler, maybe someone will write a program (hopefully in Perl or PHP) that will read/convert text on the fly for web pages (into mp3 or real audio). Does anyone already do that for regular web browsers? And I don't mean using a conventional screen reader.