Myspace has the second full-length trailer for The Chronicles of Narnia: Prince Caspian, which you can watch here.
Disney and Walden are clearly really trying to play up the epic nature of the battle scenes here, and they do seem to be a vast improvement on the The Lion, The Witch and The Wardrobe. Where Andrew Adamson's first Narnia movie had a feeling of containment, this one seems to have burst free and made the mythical world actually seem enormous. The effects have come a long way too.
The second film sees the Pevensie children return to Narnia, where hundreds of years have passed in a very short space of time in our world, and join a fight to instate the rightful ruler of Narnia: "Prrrrince CUH-spian".