Here's a few interesting links that occupied my late-night browsing...
Facebook's Graph API: The Future Of Semantic Web?
This is interesting for two reasons. One is that this is a hardball play by Facebook to subvert many other sites whose business model is linking social networking to categories of cultural artifacts. The other is the implications for the Semantic Web. I'm not so sure that the latter is quite so easily accomplished, but perhaps the 80-20 rule will truly turn out to be key here.
Mahout 0.3: Open Source Machine Learning
Neat stuff. Pulls together some fascinating technologies like Hadoop and clustering techniques. Perhaps the best thing about this is the chance to learn more about how this stuff actually works in practice. It would be great if there's a spatial component to this.
Colt - a set of Open Source Libraries for High Performance Scientific and Technical Computing in Java. One more nail in the old "Java is too slow" canard.