Welcome to the place we all came to when we first discovered the guys. Might I suggest that purchasing the CD is a great idea after you've downloaded all the free music. There is quite a bit to get for free here and at conchords.net.
The CDs, "Folk the World" and the "BBC Radio Show," have songs you can't hear anywhere else. They are great songs, sure to crack you up. Plus, you support the guys. Nothing wrong with that.
And Hi to Sam, too!