The p2 repos for Eclipse are not only for the stable releases, but also for the Milestones, I Builds and Nightly builds.
Nightly Builds: http://download.eclipse.org/eclipse/updates/3.6-N-builds
The build schedule is available here.
Go to your Preferences and add the required repo in your Available Software Site preferences (and disable all others, it will be slow to update).
Also enable the automatic updates. You are done. Whenever there is a new Milestone (or an I-Build), then your Eclipse gets updated automatically to it and you don't have to worry about installing other required plug-ins.
Enjoy with the latest and greatest without any pains :-)