Thank you for clarifying! Yes, I did read the first post, and although I'm not totally unfamiliar with computers, I didn't really register or understand the "platform" part of the chart. (I get it now, though.) I saw that "Kindle" was listed as supported and I didn't realize that the application form of Kindle was so different from the hardware device form of Kindle. Now I do!
At this point, despite this useful web site, I will probably just return to doing all my work using physical texts, and just use the e-books for things I don't take notes on. Unfortunately our copyright-loving culture has just made ebooks too difficult.
Thanks for all your good work, though!