If you’re using the DocBook XSL distribution you’ve probably already seen that DocBook XSL 1.74.0 has been released with ePub support. Note that the 1.74.0 release is an experimental release, and is made available for testing and evaluation. See the release notes for a note about DocBook dot-0 releases.
The 1.74.0 release can be found in the project site downloadsThe ePub target has been tested against a number of files, but I would encourage those of you who use DocBook to try out the new target and to submit any issues you find to the tracking system on the DocBook project site. The only way we’ll know if it doesn’t work for you is if you tell us. My personal thanks to Keith Fahlgren for driving the development of the ePub target and basically making it happen.