The Aleph project aims to build a “usable” version of Omega, incorporating e-TeX extensions.
Two sets of concerns have provided impetus to the project: first, that many users need the e-TeX extensions, and they’re not on the Omega development path; and second, that the Omega project is currently immersed in radical restructuring of Omega, and is not able to be particularly responsive to user requirements in the short term. In the longer term, the Aleph project hope that their work will be rendered irrelevant by the development of Omega proper.
The current pre-release snapshot of Aleph resides on CTAN (there are also a couple of old versions with the more unassuming name of e-Omega). Follow development by subscribing to the project mailing list via http://www.ntg.nl/mailman/listinfo/aleph
This question on the Web: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=aleph