You have to take a look at Sun CEO Jonathan Schwartz's blog today. He has pledged the company will use its patents to defend Red Hat and Ubuntu. That's the headline, and I'm really happy to know that Sun's very extensive patent portfolio is available, just in case it is ever needed. You never know these days. And yes, I take that as a message in a bottle to Microsoft. But he says it in such an interesting and creative way, I think you'll be glad if you go and read the entire entry.
Sun's Schwartz Pledges to Use Patents to Protect Red Hat and Ubuntu.