They came out with their latest album recently - Le System D.
I'd recommend checking it out. :)
But first check out their other albums.
And both rappers have solo albums too. I really like MaD SoN's "Peace Amongst the Madness".
Here's a taste of their styles:
http://www.youtube.com/watch?v=YA7USqZ52Mc
http://www.youtube.com/watch?v=asV8RIA5moo
http://www.youtube.com/watch?v=DIicyG1bgos
and much more.