Okay whatever guys. You obviously don't care about this too much, that's fine. If you cared about this even a slight bit, at least you'd give some kind of reasoning for why you keep saying "eh, no big deal".
It seems as though most of you are just going with your gut feeling that tells you there's no need to care about big (really big) companies buying each other out. Usually, there's no reason to care, that's true, but this time there's quite a bit at stake which we should care about. Namely, the Web. You simply cannot deny the influence that this will have on the Web, since two of the largest players might team up to take on Google.
Have you forgotten that one of them is a convicted monopolist that doesn't care about Web standards and doesn't care that the Internet should be a platform-neutral service? What about their record of messing up Web services they buy? Will Yahoo be compelled to switch to the Windows platform (they mostly use FreeBSD right now I think), potentially forcing them to buy new hardware while they experience technical problems in the meantime? You know that mindshare is very important to Microsoft, so certainly they won't let Yahoo's success story have anything to do with platforms other than Windows. Same for their open-source contributions and contributors; what will happen to Rasmus Lerdorf, the lead developer of PHP, who's currently an engineer at Yahoo?
In any case, I don't see any good coming out of this deal for us, the end users.