Huawei modems, often available as USB attachments, have been problematic on DragonFly.  However, it looks like it's fixed.  (I dont have one to test.)  There's a lot of names involved, so I'll just point to the commit message.
Subversion isn't being used for DragonFly, but it is available via pkgsrc.  If you're one of the people using it, the pkgsrc version has been updated to 1.6.2 which may have some upgrading issues.
When DragonFly was moving away from CVS, the votes were split pretty evenly between Git and Mercurial.  DragonFly went to Git, but it's apparently now possible to use Mercurial with a Git repository.
Statis Kamperis is working on POSIX conformance for DragonFly as his Summer of Code project; he's posted some questions about the agreement he is given for the Open Group's test suites.  If you're curious, he links to a copy of the agreement.  (I have an I-am-not-a-lawyer-but-have-worked-on-a-number-of-contracts followup)
Matthew Dillon has put together some new test machines, in preparation for porting the OpenBSD AHCI driver to DragonFly.   Check his message if you are thinking about building a new system, as they appear to work well.
Well, I'm not sure if it's out, or the new thing is the release announcement and 2009Q1 has been out for a while.  Usually, the quarterly releases of pkgsrc are available 2 weeks after freeze, which was back in March.  Either way, it's available.
Hasso Tepper has a "BIG FAT WARNING" about two new issues: threaded programs are broken on bleeding-edge DragonFly because of a possible GCC bug that was only recently exposed, and Xorg in pkgsrc has issues with the Intel driver. Simon 'corecode' Schubert already has one change in that may fix the issue with threaded programs, and is working on the Intel driver issue. Update: more threading changes.
Hasso Tepper has some xorg updates to fix problems he's seen with the intel video driver.  The versions of these packages in pkgsrc are old enough that the changes can't be committed 'upstream' to xorg, so he's attacking the problem from the opposite direction and upgrading the software. He reported significant EXA performance improvements, so it's definitely worthwhile.  It's tested on DragonFly but will probably benefit other pkgsrc-using platforms too.
Dru Lavigne has posted links to SummerCamp presentations explaining "What is BSD?".  Whip this out for your mildly confused Linux-using friends.