A Good Zip Code Database Schema

[eluser]Xeoncross[/eluser]
I found a couple of them but I was wondering if anyone knows a more current copy of the USA (or even better "western world") zipcodes. free-zipcodes.com has a descent(?) copy from 2006 - but I don't want to start with it if there is something better.

I also found these:
micahcarrick.com
phpclasses.com/522
phpZipLocator
populardata

From Elvix

Another solution to buying a Zip code DB is to use Google Map’s geocoder. I extracted the geocoding functions from a CI-enabled Google Maps API library I found, and just do queries for the Zips as they’re needed, saving the results in a DB table so I don’t have to look them up again. Works great and handles US, Canada, Japan, Europe—well, anywhere Google goes. - http://ellislab.com/forums/viewthread/78436/#393541

Anyone have some advice?