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While it's definitely a good thing, here's hoping Steam for Mac will actually be a financial success, since as excited as some people on here may get, even the potential growth from a product such as Steam coming out pales in comparison to the size of the PC gaming market, and so hopefully games can sell well enough (and we're not talking thousands or even tens of thousands of copies sold, but hundreds of thousands at least) to justify continued development on OS X.

As a side-note, as others have pointed out, games that have natively been developed for both Windows and OS X typically have the Windows version outperforming the OS X version by a decent bit. Here's hoping Valve can actually improve upon this situation, because otherwise Windows will remain the premiere gaming OS (as it probably will anyway, but hopefully the situation improves).
 
I. Absolutely. Love. Valve.
These guys are the best in the industry. I mean that is one brilliant campaign! Looks like they are porting over their games for Mac after all :D, now... please let those of us who bought the PC versions play the Mac ones too (though knowing how godlike Valve are I'd imagine thats the plan).
 
Let's hope they pull a trick like Apple did with Intel and reveal that they've "secretly been developing games for Macs alongside PCs". :D On a side note, where's the 6th image?
 
If Valve makes this investment into the community (a legit game for mac and not some crap port) than I will be more than happy to buy their mac based wares to reciprocate. ATM The only game that I plan to purchase for OS X is starcraft II.

Oh, that first apple-esque gordon pic looks sweet.

Oddly enough, I didn't know valve was based out of Bellevue (which is about five minutes away). I should go visit their HQ sometime. Nintendo is on my list too but...eh...
 
Last image; gotta be L4D2. Unless they're using this to announce Episode 3/Portal 2... Team Fortress 3? Hah.
 
Hopefully you'll be able to download the Mac versions for free if you already own the game on PC. Regardless, this is the best Apple news I've heard in a long while.
 
I am about to cry tears of joy. This would be an excellent time to click the link in my signature and join the MacRumors Steam group.
 
Last image; gotta be L4D2. Unless they're using this to announce Episode 3/Portal 2... Team Fortress 3? Hah.

Why would you think it's Team Fortress 3? TF2 is very popular and gets updates weekly; not to mention there's the engineer update around the corner.

If anything at all it's probably EP3.
 
If Valve makes this investment into the community (a legit game for mac and not some crap port) than I will be more than happy to buy their mac based wares to reciprocate. ATM The only game that I plan to purchase for OS X is starcraft II.

Oh, that first apple-esque gordon pic looks sweet.

Oddly enough, I didn't know valve was based out of Bellevue (which is about five minutes away). I should go visit their HQ sometime. Nintendo is on my list too but...eh...

Diablo III?
 
Hmm...while I do welcome this rumor and hope it is true, I don't like the fact that Mac users often have underpowered graphics cards (for gaming at least). So, needless to say this won't sway my purchasing games on Steam for Windows on my gaming machine, but I suppose if you have a high end iMac or Mac Pro you'll be good for most games.
 
Why would you think it's Team Fortress 3? TF2 is very popular and gets updates weekly; not to mention there's the engineer update around the corner.

If anything at all it's probably EP3.

Was only joking ;). TF2 is the most alive shooter I've played. 3 years old and the community is still massive.
350 hours as demoman and counting :D.
 
Games should be fun, and should be quick and simple to hop into (one reason people like consoles).

Boot Camp gaming for me is neither fun nor quick: Closing all my documents and pages, quitting all my apps, abandoning all my projects in progress, rebooting to an OS that doesn’t have my email client, my iChat, my bookmarks, and wastes my time maintaining and securing it, and then rebooting again afterward and opening up all my apps and projects all over again. All of this is an incentive to play games less often. I’m willing to pay full price more often for the sake of actually playing games more!

So I’m glad the Boot Camp option exists for those who want a certain game, but I demand OS X games :) Luckily there are more native Mac games than I have time to play (Quake Wars and BioShock alone could keep me busy for ages) but more choices would be awesome, and Valve has some great titles!
 
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