Ok, let me explain. Here in Sweden we have a category for hårdrock (metal) and this year The Haunted, HammerFall, Misery Loves Co. and The Hives were nominated. Everyone thought that HammerFall was gonna win since their Renegade album made it number one in the swedish chart. I, on the other hand, was pretty sure that The Hives were gonna win. You see, it´s always seems that the band who are least metal wins. Hellacopters, Sator, Backyard Babies, Misery Loves Co. and so on. None of them plays metal, and therefor they are winning. But this year it was different cause this The Haunted won.
Dark Tranquillite have never won a Grammy and neither have they been nominated for Best Album. But it´s correct that they were nominated last year - or was it the year before that? - for Projector. But they didn´t win. I think it was LOK who won that year.
Talking about Norway, both Dimmu Borgir and Kovenant have won Grammys for Best Metal Albums. Sorry, Dimmu have not won yet, but I´m sure they will this year. But both bands played live at the norweigian Grammy festival, with corpse paint and everything. =)