To celebrate the 30th anniversary of Space Invaders, Taito has invaded Yahoo! Japan for one day (on April 1st). The page was extremely well done, and fortunately is still available here.
From a media point of view, I like the "domination" of a portal's homepage for a day. No doubt it might result quite intrusive, but I think it offers great opportunities of creating something really outstanding and engaging. The goal must be to create an experience for the user, not just a bigger, enhanced version of a banner. And this, of course, takes time to develop, and definitely a different approach to online advertising.
via Imprint TALK.