Yes, for the N8x0. (770's SOL on this one.)
Point the webcam at the Kindle, take pictures, look at them later.
I have no information on this, but I highly doubt it will work any other way than camera or slightly more sophisticated framebuffer grabs. (For a few months, then someone may break it.)

WRT EVDO, slow RTT, who cares? eink screens update slow enough that that will be much less problematic.

I hate saying this, since I really want to love (and get) an e-ink device, but I don't really see the point of the Kindle, unless you really need some titles that are only available through Amazon.
The XO-1 seems to be better, and BOGO for the same price. The 1200x900 hybrid reflective/transmissive screen should be great for ebooks. Not quite as good of contrast as e-ink, and slightly more power consumption, but I think the higher resolution is key. Plus fast page changes, and even scrolling down rather than page changes, so you read more in a given time period.
And the XO is better for other tasks. If you're paying $400 for an e-book reader that browses and emails, you may as well get one that does it well.
The N800, of course, is also awesome for ebooks. But the screen is probably a little small (physically, not pixels) if that's your primary use, plus not daylight-friendly. And the battery life, while awesome, is not quite all-day power (in my usage pattern).
If I needed a dedicated eBook reader though, I'd jump for the XO before this. Hopefully Amazon doesn't scrap it though, and makes a Kindle 2 later. That'll be a real device, and I'll probably get one.