I am really disappointed with Google Zeitgeist, since they continue to ignore several major european countries by not including results in the reports. Portugal, Austria, Belgium are all major european countries and they are not at the list but at the same time Greece is present (i don’t think greek economy is up to compete with austrian or belgian), so i am thinking that may be the reason for this ignorance is the population. But after checking that Czech Republic has almost the same population as Portugal or Belgium, i really see no reason at all of ignoring those countries. I do not see any sequence in including one countries and excluding other ones. Also notable is the absence of Romania, with more 22 Millions of population, surely they deserve their place at Zeitgeist.
Two local search engines that i have used for years are Google Austria and Google Portugal, and since Google shows in Zeitgeist the results of other local search engines, i think it would be easy to include Portugal and Austria as well.
From programmers point of view, there is no reason at all of not doing it. From internet marketing point of view, its a terrible situation, for webmasters being excluded for quite some time, with apparently no reason at all. For example, for me the really interesting public is the portuguese at the moment, so without data from Google Zeitgeist about most popular searches i can feel a kind of ignored.