ClaueR says that his blog is not an [MS] blog.
I agree with him on principle - certainly a weblog is a form of self-expression, and not that of your employer.
I think understanding someone's background is important to understand where they are coming from. I'm not trying to suggest that seeing an [MS] next to your name helps me understand your life, but it does let me know that you have a unique perspective on what we are talking about.
It won't affect how I take your political arguments. But it might have some effect when you're talking about a new Microsoft technology or how things get done at Microsoft - since, after all, that's the focus of this community. Certainly an employee's perspective is going to be different from that of an outsider's - and it can be good to know which you are getting.
The point is that our opinions are shaped by personal experience, and your professional life certainly is a big part of your personal experience.
Also, to understand why Frans and others are concerned, you have to understand a little history about this community. Scott used to host them on dotnetweblogs.com and, as the community grew, they were eventually moved over to weblogs.asp.net for bandwidth and other concerns. A lately, of course, has been the influx of Microsoft bloggers.
So what was a community of exclusively non-employees has become a site that is hosted by Microsoft and pretty much dominated by employees.
Anyone who was involved here for awhile will be able to lament the increase in noise on the home page. The main feed has become all but useless these days.
Hopefully this helps you understand why certain people care about whether you're an employee or not. Personally, I don't really care all that much - but as I said, knowing someone's affiliations is useful...
And if you want to be known as an individual, let us get to know you. Using your full name would be a good start!