The movie was made before the series (I think it was anyway), but because there was such a huge story to be told it couldn't really be told properly in a movie so in the end it was just confusing. Fans of the manga generally seem to agree that the film was a huge disappointment but the series was much better.

Yeah the OVA does sound like the video file I watched labelled as 'Episode 00'. I had totally forgotten all the spoilers straight away because it was so confusing, but it did give me the warning to make sure to memorise which character is which (there are like 10 characters who look extremely similar, the preview thing kinda gave me the chance to work out some subtle differences [img]i/expressions/face-icon-small-tongue.gif[/img]).

I've just borrowed the movie though so I'm gonna see it again...the only thing I really remember from the movie was a certain very cool death (which didn't happen in the series) so it'll be like watching a whole new film...

EDIT - Oh btw just in case anyone didn't know boxtorrents is back up.