Just what the world needs, another first-person shooter with no plot! Not like a first-person shooter with a plot is much better (since most plots are "Find this, go here, get out alive, kill everything you see!").

Is there a demo? There is no way I am going to buy this game without being able to test it out on my machine first.

id games are great for showcasing the capabilities of whatever engine it uses. Then some other company can come along, license their engine, and actually make a good game out of it.

that i can find. they selling for mac?

I was playing the demo on my Windows machine at home - I bought for a now defunct business, so lay off :) - and it ran like total a**: 4 frames per second when things started jumping while on "lowest" vid settings, on a 2 ghz winxp machine with 128 meg video card. Now that I have a G5 tower, I'm actually in the market for software, so I'll want to see how a demo performs on the Mac before I get the retail, because I'm sure not going to get the Windows version.

Aspyr's Game Agent can tell you what games your specific machine is compatible with. You can find it here: http://www.macupdate.com/info.php/id/16709

A demo would be nice, but I know I don't have the hardware to run it :(

Wondering if there is or will be a demo of this game?
Wondering what the game sysetm requirements are?
Wondering if it will run on your system?
Wondering what it looks like? Maybe a trailor or screen shots or something?

Then why are you posting here?
Go to the Doom 3 website and look for your self. I did and found the answers to every one of everybodies questions that have been asked here.

Zaren,
http://www.barefeats.com/mac2pc.html

"The game quickly became the fastest selling action shooter in the U.S."

Heh, heh. I guess it couldn't "slowly become the fastest selling shooter," now could it?

4 frames per second when things started jumping while on "lowest" vid settings, on a 2 ghz winxp machine with 128 meg video card.

You really need a 9800 Pro minimum for a video card and 768MB Ram on a PC with a 1.5Ghz+ processor. That will get you 35+fps at 1024x768 with all the effects on high settings.

I'd be welling to bet Doom III could run fine on a 1Ghz G4. The main requirement for playability is a killer graphics card. Even if it's a current-generation graphics card, only the high-end stuff will really work. IE, forget having a great experience on an NVidia 6600, ATI X300, etc.

As long as you're ok with shelling out for a 6800GT or an ATI X800, you're good to go, Mac OR PC.

Oh, forget having a great experience with DOOM III on any laptop. The ATI 9800 mobility chip is half the power of the desktop version. The only processor which MIGHT approach the kind of power you need for DOOM III on a laptop is the NVidia 6800 to Go (so far, available only on the most high-end Craptel laptops selling for $3500+) - that processor performs on par on with an ATI 9800 Pro desktop edition.

Hopefully Apple will be the first major OEM to bring the 6800 to go to mass-scale consumers via the powerbook line.