A very nice song that could really easily be used in a trailer. I actually used this song in one of my YouTube videos and it really helps make it more dramatic (credit given, of course!).

Here's a link in case you wanted to check it out :)
http://youtu.be/_J5rwjlYsYs

This is a very, very good start to a song. Really has the potential to be something extremely epic! If you want to improve it and really tap into the potential it has, work on building up to more of a climax; more instrument, snazzy lead melodies over the top and a fairly powerful beat to go behind it. Also, the bongo drums (I think they were, anyway) at the start could probably be EQ'd a tad less trebly, and perhaps use some panning to really throw them around in the stereo field. Also, work on the mix, the drums at the start are a bit too powerful compared to the other instruments.
All that aside, I'm loving this song; it just needs a little more to make it into the epic piece that it could very well be.