Whenever I've done an Equinox release in the past, I've just uploaded the main zip file to java.net. This made it difficult for end-users because they were forced to install any optional frameworks themselves. While I've usually been successfull doing this, many users have had issues. Therefore, Equinox 1.7 will include *all* combinations as part of the release. See the Equinox Roadmap to see what still needs to be done for 1.7.
How many combinations are there? 35! That's right - there's 5 web frameworks (+ FreeMarker and Velocity for Spring MVC) as well as 5 persistence frameworks. CruiseControl is spitting out the combinations if you'd like to try them now. When I wrote the script to create everything this weekend, I was a bit worried about combining them and all getting all the tests to pass. Amazingly enough, all the tests passed on the first try. Thank you Spring, you separate layers quite nicely.
If you're interested in how this all works, take a look at release.xml. This file handles the artifact creation, as well as testing and uploading to java.net. I was hoping to create Maven 2 archetypes for all the combinations as well, but it doesn't look like it can be automated. I'd love to figure out a way generate archetypes from an existing project.