The Haxan Cloak - Excavation:
It's a dark, eerie, atmospheric electronic album that's like a full-on exploration of what you can do with bass frequencies, including lots of low, low stuff. Unlike most electronic bass recommendations, I really like this - it isn't dance music (at all), it doesn't assault you with loud bass just for effect but really uses it musically, and it's really unlike anything else I've ever heard (Ben Frost, another experimental/electronic artist, is probably the closest thing I've heard).