BSD Authentication. Why isn't PAM this sane?
Google highlights the war in Darfur. Powerful.
Openlink Virtuoso released Version 5.0.0, with SPARQL Update support. Also, it's fast and easy to set up and has the good parts of being Enterprisey.
Kerrighed, another cluster-computer OS, this one more like MOSIX, making a cluster appear as an SMP system.
This one's a short post, but there's some really good stuff out there.