Playing StarCraft II Multiplayer automatically makes me want to constantly get better at the game and watching the professionals play is extremely entertaining. So I thought I should share some of the resources I’ve found that are either educational, entertaining or just plain useful. Please comment if there is any other sites, tools or whatever that you think belongs here!
Day[9] Daily
High level Starcraft / Starcraft 2 commentary from an 11 year top player and veteran.
The Day[9] Daily netcast where Day[9] teaches us to become better StarCraft 2 players. It airs Sundays to Thursdays at 7pm PST. You can find old episodes in the Episode Archive linked below. I would recommend you watch at least the following episodes; Day[9] Daily #100 – My Life of Starcraft, Day[9] Daily #121 – Plugging Leaks in Silver Level Play and Day[9] Daily #132 – Back to the Basics: The Mental Checklist
Team Liquid & Liquipedia
A community site focused on StarCraft, with an emphasis on pro-gaming.

Team Liquid is a great site for keeping up with eSport events, finding streams of StarCraft 2 players, discussing stuff at the forums and learning how to become better at the game. A great resource on Team Liquid is the Liquipedia, a wiki full of information about everything StarCraft 2; Strategies, Build Orders, etc.
GOMTV.net
Hosts the largest StarCraft II tournament with monthly seasons.
The STARCRAFT II Open Season 2 is currently going on and the semi-finals will be aired soon (as of this writing), followed by the grand final a week later. The entertainment value on the matches in this tournament is just awesome and the “Casting Archon” Tastosis, Nick “Tasteless” Plott and Dan “Artosis” Stemkosi, is doing a great job casting for the “foreign” crowd (non-korean).
Sc2Gears
A general StarCraft 2 utility.

Sc2Gears Replay Analyzer Chart
A very good program if you play StarCraft 2 or if you just like to analyze replays. The most powerful part of the program is the Replay management. You can search all your replays and see various statistics like win ratio in a specific match-up. You can also have the program save all your replays as you play and it also features an APM alerter and more goodies.
GLHF.tv
High quality StarCraft 2 casting.

State of the Game Podcast
A podcast based around the happenings of the SC2 competitive circuit.

Weapon of Choice Netcast
A discussion and call-in show about StarCraft II.
A show talking about StarCraft II hosted by DjWheat. Also available as a podcast.
GosuGamers
StarCraft II News, replays, forums, etc

Replay Sites
Various sites where you can upload and/or download replays.

Thanks, Fredrik!