Joerg Sonnenberger pointed me at a recent post on the NetBSD tech-kern@ mailing list: Andrew Doran did some comparisons of MySQL's sysbench on a multi-CPU system, with different operating systems. It unfortunately doesn't include DragonFly, as DragonFly apparently would not boot on that system, but I'm a sucker for graphs. It also shows generally better performance for NetBSD recently than for a Linux 2.6 kernel. This is interesting in part because MySQL performance on BSD has historically been worse than on Linux.
Noah Yan has committed more of his AMD64 work to DragonFly; check the README for details on how to experiment with it.
Hubert Feyrer has done a very nice job of collating all the online material from the various presentations, with data from Axel Gruner, that happened at EuroBSDCon 2007.
OpenBSD Journal has an interesting article up that talks about the life cycle of a bug, as seen by an OpenBSD user.  I call it interesting because it gives a good summary of a bug-squishing process from a 'user' perspective.
The freeze period (where only bugfixes are committed) for the next quarterly release of pkgsrc starts tomorrow.  Interestingly, this next quarter's release marks 10 years of pkgsrc.
Strange as it is to use the words "C compiler" and "excitement" in the same sentence, there's been a lot of excitement about PCC, the Portable C Compiler, as a faster replacement for GCC. (Previous story here) There's a web page for it, and a mailing list, though no mail archive I can find associated with it archived at MARC. (Thanks, Anonymous). The web page has a link to an old PostScript document detailing the original PCC design - there's something about old Unix manuals from Bell Labs that makes them fun to read. And of course, there's always the inevitable Wikipedia page.
Matthew Dillon, as part of a larger discussion, chimed in with some sensible descriptions of licensing and how it applies to the recent OpenBSD/Linux kerfuffle.
Noah Yan posted how to apply his recent patch for building an AMD64 kernel.  Be warned; it does not create a full usable system - yet.