I'm not sure if this news was posted here, but since I'm excited about the idea, I copy the announcement here. Please note I'm not in any way affiliated with the project.
To coincide with the first
launch of ePub books by a major publisher, Liza Daly is happy to announce the open beta of
Bookworm, a web-based reader for the ePub ebook format.
Unlike most other ePub readers, Bookworm allows for full use of stylesheets and images, which is especially critical for technical books which include HTML tables and code samples.
More information in the
original post.
On a related note, a
mobile version of the reader was released a few days after.