TYCHO just released a new album called Epoch and it is yet again another great album of background work music. I've always liked putting on TYCHO tunes when I'm working because they aren't too heavy with the beats nor are they lyric-filled (in fact, if I'm not mistaken, there are no lyrics in any songs). Plus, the songs always sound like I'm going on an adventure to space or across the open plains of the US. I like that.
If you want to purchase the album, you can do so on Amazon in full-quality no-DRM mp3s.