I've updated my SNMP MIBs to support OpenBSD 4.9.
There is no functional change in this release. I did update the "pfMIBObjects.info.debug.0" OID so that it properly enumerates the logging levels which changed back in OpenBSD 4.7.
A friendly reminder that the version of Net-SNMP in the ports tree changed from 5.4.x to 5.6.x and there may be new/changed functionality present when you upgrade.
Tarball available here: obsd-mibs49.tar
Installation and usage instructions are available on the OpenBSD SNMP MIBs page.
If you find OpenBSD valuable, especially if you use it in a business setting, please donate to the project so that the code keeps coming.