More patents usable in free software...
Following the example set by Raph with his royalty free license for using his patents in free software (released under the GPL), there is now a similar license granted by Ericsson for some proposed improvements of the TCP protocol (the Eifel algorithm). More power to free software!
That license allows GPLed software to include the proposed improvements to the TCP stack, as well as any operating system that is entirely Open Source. So this covers Linux, FreeBSD, OpenBSD and NetBSD, among others.
(Disclaimer: I work for Ericsson and I contributed to the wording of that license, but I am currently only speaking for myself, not for my employer.)