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One of the greatest addons for firefox for me was always this: https://addons.mozilla.org/en/firefox/addon/5846
After a short period of getting used to, it simply feels so much better and more natural even with a normal mousewheel
It would be even more important with touchscreens and similair devices KDE aims to run on.
With Qt 4.6 and its new Kinetic stuff(check this http://labs.trolltech.com/blogs/2009/07/19/kinetic-scrolling-on-any-widgets/) it should be possible to create smooth scrolling for all KDE-apps quite easily.
What do you think?

This is a good idea
Opera has this and it is quite good.

Big +1 for this one! Smooth scrolling is such a nice feature, and in 2009 this really should be standard. Of course, there should be an option to turn it off though

This is definitelly something which makes you wonder - "why dont we have this for years already?"

Wow, it could be really nice and useful, especially with touch-screen displays...

Smooth scrolling would take some more resources, but it cannot be denied that very many users would be happy to accept this compromise. It is just one of those things that make working with your machine much more pleasant.

Yes. It feels a lot more "natural".
I've played for a while with Mac Os X trackpad smooth/kinetic scrolling feature, and think it's not only more pleasant, but also make it easier to navigate long windows, since scrolling faster you "jump" farther.
It continues to scroll for a little time even if you don't touch the trackpad, and stops immediately if you touch it. Since it works for all the windows, it seems something controlled by some driver or some gui library (sorry, don't know anything about Mac Os X internals).

Also Evince (http://projects.gnome.org/evince/) has this feature, notably only when you drag and drop with central mouse button (why not always?).

It seems also that we already have smooth/kinetic scrolling on our plasmoids... At least I've used it on RSS plasmoid. So, since we already have this feature somewhere, why don't have it everywhere?

Was this idea brutally, simply burried?
Was it implemented?

It could be so great....

I think it has been implemented in Qt, but it will take a while to add support for it in all KDE applications. Dolphin in 4.8 has it since it is using a new file view, and I think all QtWebkit-based browsers have it, and plasma has it, but I think it requires some underlying changes in the software so it will need to be implemented on a case-by-case basis. I expect other file views like the file open/close dialog to get it eventually, maybe as early as 4.9, since they will probably switch to using the same file view as dolphin once all the kinks are worked out and the new version of dolphin has feature parity with the old one.

+1. If as OP says, this was important in 2009, imagine now.
The jumpy scroll makes the entire OS seem primitive. We cannot let MacOS have the landslide advantage they have now...

Btw, I don't even use a pdf reader on the desktop just because the one google provides, as much as it sucks, has the smoot scrolling...

Still desperately needed in KDE 4.11.2, especially in something like Okular where all you do is scroll through text. Right now I've set mouse wheel scrolling to 1 line which helps but also removes the ability to quickly scroll using the mouse wheel since there's no acceleration feature. Some apps don't even obey this, like Kile which uses katepart but doesn't obey the global setting of number of lines to scroll. Things are a bit of a mess at the moment.

Am I the only one who still waiting for this feature?

2022...still waiting