Hi,
First off, let me say I love this site. Not only does it provide a great service, I really like the look of it and how smooth it runs. One thing amazes and puzzels me equally: When uploading a sub you can make a search for the imdb-ID (http://www.opensubtitles.org/en/upload) - and the IMDB-search results are shown locally here on the site (with a javascript link that will copy the imdb-ID to the submission-form) - how on earth is that done?!
I checked the FAQ "What technology is used on your site?" - but this particular topic is not mentioned...
Cheers!
Bayswater