keith said:

Though HTML5 seems to be the future, it is so to say futuristic. I mean its final is expected first in a decade!

.epub2 still doesn't have one viewer-program that supports the spec totally and completely. not a single one... not after an entire decade... and as the attention has now shifted to .epub3, we can confidently guarantee that _it_never_will_. of course, this means that even by the year 2020, .epub3 will not have a single compatible viewer... but since we'll be on .epub6 by then, who cares? i advise offering stuff in every format you can, and hope like heck your audience can read one. just one, please, that's all i need, one good one.

Let's keep the facts in prespective.

good idea. here's the reality. for the next few years, very little is going to happen to move e-book software ahead. adobe has been doing as little as it can... in 2011, it made one update to adobe digital editions. one! and adobe is the lead software company for i.d.p.f. apple recently came out with an update for ibooks. atop the list of new features was "night-time mode". that's right, they finally did a white-on-black view! imagine the programmer-years _that_ feature took! good thing they're a rich company, and can afford it. but wait, there's more! they _also_ now give you the option to remove the print-book background-image. their programmers worked overtime to deliver that! what powerful capabilities will they dream up next? google? readers are _stampeding_ to google-books. and amazon has finally decided to drop mobi! yay! so we no longer have to deal with a format designed in 1995. unless, that is, we want to still move books to all the kindle hardware that's out there right now, because amazon isn't going to update their firmware. so now we'll have to support mobi _and_ kf8... yay! so tomorrow will be the same as yesterday, buddy... .pdf, .html(5), .epub(2), .mobi(1995), .kf(8), .txt(70). can you feel the _excitement_, keith? it's _palpable_! -bowerbird