Well, the post that I created here originally was thought as a supplement to this bug (in order to break Microsoft's major market share, certification has to be improved). And as Mark is the reporter of the bug, I thought there might be chance that he'd read it.
The rest is just a discussion emerged from my original post, in which I let flow in some things that I am unhappy with and which could be improved (sorry for offending anyone, if I did)
While there may be other ways to contact the persons responsible for certification, I do not know what is wrong of posting the feedback as a question on Launchpad to which the Canonical Hardware Certification Team is subscribed to (see question #216889).
I did not install Windows first, I also tried other distributions, including Fedora 18 Beta, which ships with a quite recent kernel.
I do not see the point of trying Linux Mint (as it ships with the same Kernel as Ubuntu) or a different version of Ubuntu (as I already tried two).
For Windows, it worked pretty straight forward: It detected everything, except the touchpad and the harddrive acceleration sensor. Installed both drivers, and I was ready to go. Still better than having to compile a custom touchpad driver that adds support for my Alps touchpad.
Just to sum it up, I do not want to harp on Ubuntu's hardware support - of course it is harder to support hardware if vendors do not provide drivers or anything. If I install Ubuntu on some machine, it is acceptable for me that I may have to tweak something, considering it is free and open.
BUT: If I buy a Ubuntu certified machine (I suppose that Dell pays some money to Canonical for certification, rights to use the Ubuntu brand, Hardware enablement...), shipping with Ubuntu, I expect everything to work (as it is with Windows normally) and that the changes required to make the hardware work are made flow back upstream, so that it works with other distributions, too.
Otherwise, I do not think that Ubuntu can not be seen as a serious competitor to Windows.