Actually, MS releasing open source stuff is a good thing. If all the kids do it (google, MS), then Apple would look even more closed if it doesn't. Any releasing open source at all is good news. Why? because I can imagine how this can culminate on a world where the PR/marketing depts see it as a powerful way to woo audiences (remember devs's standing ovation -and raising their laptops- to the Wave presentation?).

The sooner this 'clicks' on any marketing high-up at Apple, the better.