It's called Crackle, and it's free.
Though you've probably never heard of it, Crackle's been around since 2007, when it was acquired by Sony (and known as Grouper). For the past two years or so, the service's primary claim to fame was streaming episodes of "Seinfeld."
However, Crackle just joined the big leagues (in my humble opinion) by adding the first two seasons of "The Shield," the Emmy-winning FX cop show that only recently came to Amazon.
Of course, you need an Amazon Prime account ($79 annually) if you want to watch the show there.