Apple & Intel: What you need to know [via]:

Will my Intel-based Mac be able to run Windows?

It seems likely, although Apple won’t support it. Someone will probably figure a way to install Windows on a Mac system so that you can choose to boot into either OS X or Windows. In addition, consider a future version of Virtual PC that lets you run PC applications at full speed, on a window within your Mac (or on a second monitor). There are some intriguing possibilities here for Mac users who must use Windows applications some of the time.

But if all Macs one day will be able to run Windows, won’t application developers stop creating Mac versions of their programs?

It’s possible, but not very likely. Mac users are Mac users because they want to run software in the Mac interface. The large software companies that publish programs on the Mac understand that, and so do the small Mac developers who are making the coolest OS X apps around.

…and other questions and answers, but I’m quoting these because the second one is unseen before, and particulary interesting. Even though the answer they give here might be a tad optimistic.