Saw Scotland's Twilight Sad (
www.myspace.com/thetwilightsad) at SXSW earlier this year. Most intense band I've seen in a long while, walls of white noise.
Another couple I came across from the same area that I reckon are worth a listen are Broken Records (
www.myspace.com/brokenrecordsedinburgh) & Frightened Rabbit (
www.myspace.com/frightenedrabbit)