Eclipse Equinox P2 
I had been playing around with integrating some eclipse plug-ins at work here into our build system. It turns out that this functionality has changed significantly since Eclipse 3.4M6. This write-up might be helpful for folks who might be interested in this topic:
http://wiki.eclipse.org/Equinox_p2_Getting_StartedI've been working on some OSGI/Equinox stuff at work here that's pretty cool! :)