I am considering self publishing my non fiction book online (in order to save cost) but I need to choose between ipad or kindle. I do not know which one of them is the better option in terms of marketability, distribution, royalties, cost etc. Then again, is it possible to publish on both of them simultaneously?

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If you go to Smashwords, you can publish in six different formats, so your book can be read on both ipad and kindle. Also Sony, Diesel - go to their site and read about it.

Almost every electronic book reader out there can read pdf files. As the above post mentioned, many companies will format ebooks in different formats as well. I think you need to focus more on who has good distribution for your work than what device people will read it on. I will say however, as someone who has recently purchased an Ipad, I don't see the kindle competing.

News Corporation's digital boss Jonathan Miller thinks iPad will provide stiff competition for Amazon's Kindle, and could even kill it if Amazon doesn't radically retool its e-book reader. He sees iPad as a Kindle-killer.

Kindle is definitely an amazing device. Its worth the money.You can put ebooks/notes/audio books on your kindle also Notes and annotations are very easy to make.Very easy to use with the PC and the Mac Kindle is very straight forward there's no need for additional software required for Kindle. Also supports you can also increase the text size which is again amazing.E-INK screen technology that don’t glare in any light so no strain to eyes and less harmful. There are wide range of books on kindle many are free and other are cheaper at price than the actual books so yes I have saved a lot of money till now. You dont have to carry now all those heavy actual books, kindle is so light weight which is carrying almost 1500 books within it. Since I travel a lot I really like the 3G Internet you can get the internet wherever you go. Whenever you are tired of reading you can also you Text-To-Speech with auto-page turning feature which is jst so relaxing. If the small size strains your eyes a lot than can also change the text-size. I must say Kindle is a small magic books really I cant live without it. Amazon Kindle at amazon $139 http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=kindle&x=0&y=0&tag=klnprk-20