TGM HOLiC aka Jin8 playing TGM3. He's the best Tetris DS player in the world. If you think it's fast at the beginning, wait until it gets to around 3 minutes in.
TO Jam is an annual gathering of game developers in Toronto. They get together and spend 3 days creating games from scratch. This year, 62 brave souls cast aside sleep in favor of caffeine to participate in the event, resulting in 26 games being created in just 72 hours.
And here's the best part: you can download and play them all for free! The organizers of the event just finished posting this year's creations. Below are the most recently added games: