Area 11 - J-rock themed goodness chock-full of anime references. Although they've got a hell of a lot more coverage ever since they partnered up with the Yogscast, which is how I got to know of them. They currently have an EP out, and are recording their first album.
These are a couple of songs they've put up on YouTube:
These are a couple of songs they've put up on YouTube:
(Song begins at about 1:24)