As readers will know, Harry Potter and the Half-Blood Prince will be opening on over 160 screens in IMAX starting Wednesday, July 29th. As such, WB and IMAX have now launched a new video intro from actor Dan Radcliffe, as well as a contest to win a special Half-Blood Prince T-shirt and poster; all can be found here. Be sure to scroll down to access the video section, where you can see a new trailer for the imax (tv spot and regular trailer) as well as check the downloads for a wallpaper.