It's a mix of traditional death metal and folk metal (Ensiferum, Korpiklaani, Fintroll, etc.). Folk metal is interesting, sometimes really good, but having the death influence really makes for some great music.
I like Havok. Kinda got bored w/that latest album after listening to it a bunch, but it's still solid!
Here's a local band, Battlecross, that I found earlier this year. Got to see them in Westland at the Token Lounge a couple months ago and they were f'n awesome. They were just on tour w/Five Finger Death Punch, Trivium, Killswitch, etc. Awesome thrash with a bit of death influence!