In Eclipse 3.6 M7, PDE will offer a new wizard that allows you to take the contents of your currently active target platform and dump it on disk somewhere.
We used this utility while writing the OSGi/Equinox and RCP books and I finally got around to pushing it into PDE (it was hiding in the PDE incubator for awhile). Thanks to Ian Bull for using one of the tried and true methods of getting people to do stuff in open source: patches and nagging 🙂