worked it out, using IDM right click (somewhere other than the video) and choose Download FLV -> Last accessed video file.
And voila, off it goes. You can then close the site without it affecting the download.

I've found through some anime-freaks forum NicoNico is a good resource for dubbed movies/shows and I've been using it for a while now (standard 吹き替え and its abbreviations apply). I'm still learning how this site actually works (mylists, playlists etc.) and don't know how long it will be available but yesterday I found this treasure:

http://www.nicovideo.jp/mylist/12976465

There are other lists like this one so all you have to do is search but only for lists and maybe add "1" (movies will be in parts, longest files with dubbing have 50mins, I've watched Transformers in 10min chunks).

Does anyone have a website to download English subtitles for movies?

With the regional encoding for Blu-ray, Japan and North America are now in the same region so legal non-pirated copies of Blu-rays will work. For those in the same region, that gives you access to lots of Japanese movies, as well as movies with Japanese subs and dubs. Now there's just the matter of importing if you're outside Japan.

Any good sites for Japanese subtitles for movies?