Ratatat last night at the Black Cat and they were fantastic, the best show I've seen in a long time. It's just three guys with a keyboard, guitar and bass (plus a drum machine, fog machine, and light show) and they tore the room apart. The music is entirely instrumental and most of the songs build before exploding into chunky guitar riffs and keyboard blasts. A lot of the first album is repetitive, in a good way, and kind of reminds me of video game music (specifically Castlevania for some reason), and the other songs they played were also really good. I especially like "Crips" and "Wildcat", which is on their myspace page. The music sounded great live too, the extra volume and fuzz and pretty energetic playing made stuff I like really great. The intro to "Seventeen Years" was probably the closest I've seen the Black Cat to going completely crazy.
I like these photos too: