There is .djvu format by Lizardtech that is more and more widely used for scientific publications. Its main characteristics is that the compress ratio is about 10x better than in .pdf format at the same quality. Nothing beats it at the moment for b&w text and pictures.
Added to main description - thanks
PDF can get close to .djvu in size if you encode the document in the same way as djvu - segment the pages into text and background, compress the background with jpeg2k, and the text with jbig2. Most of the books on archive.org are processed this way. --188.8.131.52 17:26, 1 October 2014 (EDT)
Added the fact that BBeB has the extension LRF.
Why isn't the Bookeen reader listed as supporting .TXT? Surely it does? At least the dedicate page on this wiki says so. ---- corrected, but you could have done that yourself. DaleDe 11:41, 18 January 2008 (EST)
 Need to update the table
The table listing what readers support what format needs to be updates :) --184.108.40.206 00:10, 23 March 2009 (UTC)
The IREX DR800SG supports ePUB.
For statistics on this page see Page Statistics#E-book formats
 CBR and the like
.cbr is a a format designed for viewing comics. They ar both compression and graphic formats so i dont know which should be used. Cheers Sindre
It really doesn't matter that much. The images are compressed so you don't get much more compression from the container. It is said that CBR is slightly more compression but the tools for CBZ are much easier to find.
--DaleDe 01:05, 20 February 2012 (EST)
 Kindle Fire
I cannot say that I know what KF8 means, but the Kindle Fire uses the mobi format. I know this for sure as I use it all the time in my Kindle Fire. The only drawback to this is that they show up in in Documents. The popular Calibre ebook conversion software specifically converts files to mobi for Kindle Fire. For this reason, I have added the Kindle to the Mobi format list. MagnoliaSouth talk 10:21, 24 April 2012 (EDT)