Here's another trailer from Persepolis, based on the graphic novels by Marjane Satrapi, which may make you fall in love with "Eye of the Tiger" all over again:

OMG, they made a direct-to-video cartoon of the Turok: Son of Stone comic book, hewing closely to the 1990s reboot of the character (warning: this one has dinosaurs and blood):

Also, technically it's not a trailer per se, but Neil Gaiman has posted a short clip from Coraline, the computer-animated adaptation of his fantasy novel coming out towards the end of 2008: