
I have a Kindle and love it; my husband has a Sony and loves it. I can read HTML files but not RTF; he can read RTF but not HTML. He can read the ePub format, I can read the Mobi format. We both read books without DRM most of the time, but I have a few azw files from Amazon, and they can never take them away from me. You see, I download all my purchased books to my computer. I keep them in the Calibre library, where I can sort by author, series, and genre. I also can convert formats in Calibre. The good thing is that Calibre keeps the original format, so if I convert a plain text file to mobi for my Kindle it can be converted again to LRF/epub for my husband. Usually I convert RTF files to mobi, and HTML files to epub. I also leave Whispernet off when I am not downloading a book from Amazon. No reason to have it on otherwise; if I want to surf the Internet I have better devices.
We will both be looking at iPads when they appear in stores. I am doubtful that one could replace my Kindle; e-ink is incredibly easy on the (somewhat aged) eyes. But I see other uses for the iPad for which I cannot use my Kindle.
The star of riches is shining upon you.