So PW Core is finally in the tree and is available in nightly builds as of April 24th, 2008. The extension is also up and running on Mozilla's addons website and can be downloaded here.
I have also created draft support documents for both PW Core and the extension:
As always, your feedback is appreciated!
The article on PW Core has been generalized and moved to MDC. Find it here.
Also, thanks to Cesar, my extension went public on AMO. See link above for download page.