Living in a country that translates almost all movie titles (Germany), I often knew movies only by their German translated title, so I had to go to imdb.de, type the German title, then look for the Original one listed under alternative titles. Very annoying, because imdb.de is perfectly useless and lacks lots of information compared to imdb.com, so if I wanted to know anything else about the movie I also had to go and switch to imdb.com after finding out the Original title.
But now I found the solution: on akas.imdb.com you can search for any alternative title of a movie! I hope this infomation is as useful to some of you here as it was for me. If not, sorry for posting ;)