I found this trick out last night for anyone not living in the US who wants to access the PSN video store.
Firstly, log on to a US account and open up the PS Store. On the 'Home page' there is a random selection of banners, varying from games, DLC, Demos and ... full films from the PS Video Store! If a film is not one of these banners when you initially enter the store, then simply click through to anything on the store then go back to the home page, where a new selection of random content appears.
Eventually you should see a film appear - click through on this link, and you'll be given all the options to Buy, Rent, Preview etc.
Of course, this isn't a particualrly effective method of accessing films from the US store as you're randomly 'given' one to pick, and actually purchasing something is still a little tricky, but nevertheless it's still interesting how Sony overlooked something like this.
Updates:
As has been discussed in the comments, please do NOT attempt to purchase any of these films as all you'll recieve is an error message ... after you've paid.
