I am currently just using mobipocket as my reader so I know this limits the books I can read. But for now I am using the "Reading List" options undet the DETAILS part of the "eBook" menu on the menu bar.
Since a book can be in several "reading lists" at the same time it seems to work well enough.
I am using:
Reading
Unread
Read
SciFi
Mystery
Biography
Sports
Reference
And a few other "lists" I find useful for me...
It seems easy enough to remove and add a book to a list. Then when in the mood to read something new...simply display a list of books for that list. Which I want to check on if I read a book I simply need to "DETAILS" of the book...
Or even easier...the LAST READ date field on the same DETAILS screen for the book.
For now that should be fine. When I have time I'll whip up a Foxpro, Access or whatever DB and stick the info there...but for now this is simple enough for me to keep track. But, yeah, tracking ebooks might be harder then pbooks I guess...