My preference is for Tom's eTextReader
This one looks pretty good. I'm downloading it now, and will try it out. It seems to be able to handle TXT, RTF and HTML, and to be able to look inside ZIP archives, which is the minimum I would expect in an e-book reader. The latest Release Candidate even seems to be able to read MS Word DOC files and Palm files. If it can do all this smoothly, about the only thing it is missing is the ability to see inside RAR archives.
Just wanted to add that I installed Tom's eTextReader, beta 1.9.1,
and it looks like the reader I've been searching for. It is a very
nice program. I'm running the latest beta, but haven't encountered
any problems with it. I tried it out with Palm files, RTF, TXT and
HTML, both open files and files inside ZIP archives, and it
handled all of them. It will open and display RAR compressed
files, but the display is garbage.
The menus and controls are very sane, particularly in comparison
to uBook, which has always had a quirky and counter-intuitive
interface. It's easy to select any page via the graphic slider,
and to edit the text via the built-in text editor. You can, if you
wish, save the files to a unique ebook format (which is just a
text file with a different file termination) in order to keep them
separate for easy reference, but the program doesn't mess with
your existing archives if you don't want it to.
I was surprised by the number of useful options. The only
shortcoming I minded, other than the difficulty in displaying RAR
compressed files, is the limited choice of an interface. It would
be nice to be able to customize it more easily, and more
extensively. On the other hand, the existing interface choices are
very good.