My Zoneinfo TZ library is now available up at the Codehaus. V1.0.0 should make it to the central Maven repo shortly. The project has mailing lists, continuous integration, issue tracking and all of those things you'd come to expect.
Interestingly, the site that hosts the zoneinfo files themselves has disappeared tonight. Fingers crossed that it'll come back soon!
I hope that this project proves useful to someone other than me! Enjoy.