I posted here previously how Yahoo! were making signing up for an account difficult if you were Irish (you had to fake a postcode and their validation code wouldn’t accept most attempts). This affects you if you want to use any of their services, Flickr, Del.ic.ious, Mail, etc.
I’ve been following this internal change, and it looks like it was pushed out to production; the postal code field for Ireland has been removed
Sure enough when I went to the Yahoo! sign-up page and chose Ireland, the Postcode field disappeared:
Kudos to Yahoo! for (finally) fixing this.