The buzz of internet film teasers :

Last weekend, film director McG stepped off the Terminator Salvation set and screened its teaser trailer at the world's biggest comic book convention in San Diego.
"It felt good to put that footage in front of everybody here. We're only half way through principal photography. So I wanted to make sure we were on the right track," he said.
"And to get that response really galvanised our efforts, made us feel like we were doing the right thing."
McG could have saved on petrol and checked out the audience's response from the comfort of his Winnebago.
The same trailer surfaced on the internet two weeks earlier and had already been discussed and dissected by fans, fuelling a publicity machine on a movie not due to be released for another year.
Obviously film studios aren't missing this trick.
On Wednesday, a minute-and-a-half of Harry Potter and the Half Blood Prince was released online, two days before being shown on cinema screens.