And its not even playing the game. (I do that a lot anyway)
 
I was up until 4am last night watching replays on youtube and some backlog of day9's daily.  They are entertaining and informative.  The older ones from beta are less informative on what units can be used now a days, but  the general info that is given out by the commentary really helps.  The strategies used in microing haven't changed very much.  If you are interested in the competitive online aspect of the game, but haven't checked out any replays, I would recommend doing so.  Even watching them for races you don't specifically play are informative because you get to see strategies that they can use against you.
 
SCLegacy: http://www.youtube.com/user/SCLegacy 
Day 9:  http://www.youtube.com/user/day9tv
             http://day9tv.blip.tv/posts?view=archive&nsfw=dc 
             http://www.teamliquid.net/forum/viewmessage.php?topic_id=104154
 
Those are the ones I've used the most.  Day9 is very good and informative.  He also has a sweet Diablo 3 post on his wall that I want.

I find this post thrilling.

I've become addicted to watching commentated replays as well, and streams on team liquid.

SCLegacy ftw. I was at that community for the longest time before.

Thanks for the info, what all races are you guys maining?

This happened to me with WoW. When I arena'ed a lot, I would constantly watch play by plays.

reallylongwordwithmorethaneightcharacters

day 9 is awesome, he is the only guy out there who doesn't make esports sound kind of creepy

" Thanks for the info, what all races are you guys maining? "

Ha I have been doing the same thing, HDStarcraft has some good youtube videos too, his are pure commentary on matches but they are very informative for newer players or people who haven't played SC in awhile.

Thanks for the links broski. 
 
Also, does anybody else love the Terran Marauder? What a pimp he is.

I've been watching HD Starcraft and Husky youtube videos. I have to say, this is my new addiction too. I was never one to be able to watch sports broadcasts and thought it was the most boring thing in the world. Now I kinda get it. I guess if you know the game a little and get to listen to experienced people give play by plays then it can be really entertaining.

I watch alot of HDstarcraft.  His commentary really helped.

" Thanks for the links broski.  Also, does anybody else love the Terran Marauder? What a pimp he is. "

I just purchased and downloaded SCII yesterday, still haven't gotten a chance to do more than just watch the introduction video though. The end of the day can't come soon enough.

Brad was right about the replays, they're all super helpful. 

I think I am in bro-love with Day[9]'s voice.  He and Brad should get together and record an album of sweet sweet dulcet tones.