The latest episode of South Park is on YouTube. In "Cartoon Wars", people are protesting against Family Guy (another popular cartoon in the US) for airing an episode with a cartoon of the Muslim prophet. The dude who uploaded the episode on YouTube split it into three parts. You can watch it below. Warning: Episode may offend some people.
You can also download the episode using Bittorrent via MrTwig's net. I can't wait for Part 2. South Park rocks!
Update: South Park Cartoon Wars Part 2