my stream: http://www.twitch.tv/delbuster
http://www.twitch.tv/vgbootcamp - not always Smash 4, but they are one of the biggest smash streams in the country. They have a Tuesday weekly Smash 4 tournament.
http://www.twitch.tv/clashtournaments - The other big smash team. Sometimes Isai streams Smash 64 online, sometimes they stream events for various smash games.
http://www.twitch.tv/smashstudios - Hosted by PBnJ, streams Smash 4 a lot, including online stuff.
http://www.twitch.tv/edmontongamers - I think they host online tournaments
Smash 4’s answer to SaltyBet:
Some popular player streams:
Feel free to post streams for other games as well.