Hey! Actually it depends on your field whether the last author is important. In my field the last author is not viewed as important, but simply as the person who has contributed the least, so it's the worst place to be! I know that in other fields the last author is often the grantholder, so it's almost as good as being first author, but it's not the same across the board! If there are a lot of authors I'd say the nearer to the beginning you are, the better, but I'm just saying this on the basis of my knowledge of my field! Best, KB