Films

Harry Potter and the Half-Blood Prince International Trailer
Not officially released yet, though this is surprisingly good quality for a leak. Anyhow, it looks like it could be quite good. Order of the Phoenix (that was the last one) was well directed by David Yates (who returns for Half-Blood Prince, as well as the final two films, Deathly Hallows Parts 1 and 2) but let down by a script that sometimes felt like a very long "Previously on Harry Potter..." recap of the novel. That was written by a different screenwriter though -- hopefully the return of Steve Kloves means something more akin to Goblet of Fire (that was the fourth one), which managed to abbreviate the lengthy novel sensibly.

Valkyrie Trailer
Looks pretty dismal if you ask me.