Me too. I wonder if it would allow me to really utilize it the way I want. I download a bunch of free (copyright long expired) books through google books. I would like to be able to upload these 100 year old books on a Kindle to carry around with me. That would be great. I could have a REAL library in a book bag!
IIRC, I've read that you can upload files (I don't know what file format) into the device, which then allows you to browse them like any other Kindle book, in theory. It's a big draw for me, too, as I have dozens of e-book files that I'd love to read on an eye-friendly device.
For me, the one big downside is that the Kindle is designed as a tablet. I would much prefer a folding device that has dual screens. Such a device folded shut would protect the screens when not in use, and when held open would be like reading a real book, i.e. I could see two pages at a time.
The tablet design, i.e. a single unprotected screen is the chief turn-off of every e-book device IMO, but I realize it's a tradeoff to keep costs down. Double the screens = double the price.
If I understand the Kindle correctly, it would be perfect for someone who wanted to collect out-of-copyright books. I understand they have a large collection of them themselves that users may download at no extra charge. Their value proposition is that most people want current writings, and that’s probably pretty accurate. But someone like you could REALLY take advantage of it.