Regarding tomorrow's event...

[mrat93]

Does anybody know if there's gonna be a Keynote stream online? What about a spoiler-free page on MacRumors? Anything on MacRumors Live?

EDIT: Sorry, but I couldn't navigate to the "Other Mac Topics" forum to post for some reason.

 

[FredAkbar]

There are never live Keynote streams provided by Apple—not anymore, anyway.

Regarding the rest of your question, see today's rumor about the iMacs:

Since MacRumors was not invited to the Media Event, we will be unable to provide live updates, but we will point you to sites that can and provide running updates as well as the usual lively discussion. We will provide SMS updates for those away from a computer but no spoiler free coverage will be provided as we are uncertain if a full video of the event will be posted.

 

[MacNut]

I don't think there will be any huge news that a major event has. This will probably be normal updated stuff.

 

[kymac]

engadget was invited, they're providing live updates here:

http://www.engadget.com/2007/08/07/live-from-apples-summer-mac-product-press-conference/

they usually have pics up pretty quickly, with text updates consistantly.