Unfortunately I don't think a website like that will make a scrap of difference
What will do is Microsoft's actions - to either say Linux does or doesn't offend against Microsoft IP. They say it does but then that needs to be backed with a lawsuit and it means nothing without it.
If Microsoft keeps on saying it does and can't/won't prove anything then the allegations will die like SCOs ones. Is anybody scared of SCO now? People possibly are scared of Microsoft now but won't be in a year or two if they don't sue or make a hash of a lawsuit (like SCO).
While I agree with your original premise, I think this is a very different case to the SCO case. First, there are the relative differences in the sizes of the companies. SCO was a failing vendor, who were going through all sorts of attempts to retain their market share. The whole thing was a joke from the start. Conversely, Microsoft is a dominant position in the market, and is doing this to squash opposition, not to fund a golden handshake to the board of directors. SCO's claims only came out with a lawsuit, whereas Microsoft's claims come out all the time, without a lawsuit, and it is the threat of litigation that causes people to buckle. Microsoft hasn't needed to bring a lawsuit against "linux" or it's vendors regarding these threats to date because the fear of this happening is enough to foment resistance to using linux. This is changing, slowly, but it's still the case. Personally, I don't think this website will work because no legal department or advisory on the planet would let Microsoft play its cards. The lack of play doesn't mean the cards doesn't exist either (although I personally think it's all FUD). I also don't think any legal department or advisory on the planet would actually advocate that the lack of play means the evidence doesn't exist. It's just too great a risk. Welcome, FUD.