The tutorial replaces an older one. It's much better because it focuses specifically on code completion, not on extraneous stuff like web service clients and Options window integrations. In the end, you'll have a simple code completion box in HTML files, listing countries that can be selected and inserted into the editor:
The tutorial applies to NetBeans IDE 6.0 and upwards. It also contains a link to a plugin that provides the sources of the sample, in case you get stuck.