Shoutbox

Interesting debate going on here, so I feel I must chuck in my two cents worth.

Linux stability falling with more support: Won't happen. This is for one very simple reason: Linux is the kernel of the OS, not the entire OS. If the stability falls, it'll be in X or bash or Wine or something, but the kernel will remain just as stable. Of course, it'll appear as though Linux is less stable, which I guess is the whole issue. At least you can just fall back to a text console and solve the problem, rather than reboot like in Windows.
Combining Windows and Linux: I believe there is a Linux app they call Wine...
Linux using Windows .exe format: run Wine. It's getting better all the time.

Which is best? Depends what you want to use it for.
Speed and stability: Linux
Multimedia and app range: Windows

Of course if you can't decide, do what I do: use both. Dual-boot WinXP and Fedora Core 2 is what I run, and I have FreeBSD 4.8 on disc for an old laptop I want to get working.

Edit: Wow, that seems more like my £20-worth...