I buy books from a commercial site. The Adobe ebook reader will not function under Linux, but I can download to my Mac. Too big to use comfortably though and the download is only licensed to one computer. HOWEVER a number of the books are in eb20 format - and can be read online from any computer I wish to use. Works quite well and would be perfect if I could rotate the page 90. Can't find a way of doing it - but this may be because 3.1 is still Beta. Anyone help or comment?