Reporting from the MipTV conference in Cannes, the Guardian quotes Patrick Walker as saying his company will introduce the new formats slowly, getting user feedback along the way.

"If you have been delivered ads that are relevant, interesting and geographically specific, that itself becomes interesting content," [said Walker].

"If you want a 30-second pre-roll ad you can wait.

"Right now we're about user experience and if you focus on that, the business will come." ...

He added that 2008 would be the year that content providers saw "real money coming in" from video advertising and predicted that previously reticent producers would join in.

Mr Walker said the company was frequently approached by producers and broadcasters who were becoming more comfortable with YouTube as a distribution outlet, especially to reach new international audiences.

He cited recent deals with broadcasters Antena 3 in Spain, Deutsche Welle in Germany, and the BBC in the UK, all of which have branded promotional channels on YouTube.