Saw Insomnium at Bloodstock a few weeks ago, was fairly impressed by them - solid melodic death metal. Kinda reminded me of Omnium Gatherum a bit. Gonna have to check this out, I think.
New album Across the Dark (2009) shows a band that knows its strenghts but isnt afraid to evolve. Crux of the music is still melodic death metal but nuances are giving it a unique flavor. Keyboards are overwhelmingly epic and there are some stunning clean vocals by Jules Näveri. Bit of folk metal, pinch of doom, some thrashing, a whole lot of timeless melodies and progressive twists and there you have it: ingredients of the masterpiece.