The debut album for the band Bassinvaders came out the end of last month, and I must say, it's fantastic.
http://en.wikipedia.org/wiki/Bassinvaders
The way the songs are arranged is very interesting, a bass for the bass line, a lead bass, and a rhythm bass, then some guest basses at parts. It works very well. Some of the songs are a bit chaotic, but I believe they were going for that sound on those songs.