DS Lite as ebook reader?

I just heard that you can use a DS Lite as an ebook reader. $150 for an ereader? Sweet! (Kindle, for those who don't know, is $359, and the new Sony 700 is $399. And then you have to buy the actual books.) Does anyone know anything about this? I have many questions.

1. What is the screen like? I've rejected the idea of reading ebooks on a cell phone because the screen is just too small. I want something more substantial, closer to the size of a real paperback book. I know DS Lite has two screens, so it's supposedly visually more like reading a regular book. I'm just worried about how big those screens are.

2. Can I buy books anywhere? I've compared prices for a couple of books I want, and the Kindle prices were better than Sony or Fictionwise. Can I buy a Kindle version and put it on a DS Lite? Am I limited to certain sources of ebooks?

3. How hard is it to get the books onto the unit? I am techno-deficient. Some days getting this blog to post properly is beyond me. I don't have the knowledge, time, or patience to fiddle endlessly with formats, trying to get the text to play nice with the unit. Is it simple or am I going to have problems?

As I said, I'm pretty ignorant of this technology stuff. I'm sure there are things I should ask that I haven't thought of yet. If anyone can share some info about using the DS as an ebook reader, I'd be really grateful.