There's a featurette on-line for Harry Potter and the Half-Blood Prince and it's got quite a bit more footage. One thing that's clear from it all is that the budget for special effects has increased as has the dramatic element of the story.

This looks much more perilous for Harry and friends, although it's nicely balanced off with humour and the friendship element, not losing what the Potter films are best for.

What do you think of the Harry Potter and the Half-Blood Prince featurette? It's certainly showing off the effects of the film, and it looks like we're going to see many of them too.

There's plenty of behind the scenes footage and some words from director David Yates, Daniel Radcliffe, producers David Heyman and David Barron, Emma Watson and Rupert Grint about the film, the story and the characters.

I actually think this is a film to look forward to, and I am enjoying the series more and more as it grows up through each story and gets a little darker and a little more adult with each.