I'm pinging Jon Griffin who apparently has the lastest version of the data. And thanks to Dave Bauer on irc, I now know to check the other ref-us-* packages for how to setup loading the data.
The zip-code data is in the Attic. Don't ask me why but it's there ... I don't know if it is accurate but that's the us-zipcodes.dat file that you need to load the data ...