on the american publisher website, EnMasse, its avaiable a streaming version of tera to try for free.
it contains 3 chars pre-created, no donwload is required to play it, something simmilar to the service provided by OnLive were you rent games without download.
of course this will depend on your conection, but can be a good way to show the game to a friend of yours and make him join european tera, just remind him/her that the demo is on AMERICAN website and he MUST NOT buy it from there, but from european site.
just go to tera.enmasse.com and you should see a big green button to play the demo free without downloading the game and no need for an account creation.