ATM this list is unordered, just a bag of ideas how a FreeBSD QA checklist should look like. It's also very incomplete ATM, feel free to add your ideas, HOWTOs and improvements here.
* new install on a clean HD (dd if=/dev/zero of=/dev/<harddisk> bs=512 count=1) via: ** FTP (more than one system required) ** NFS (more than one system required) ** CD-ROM
* minimal kernel + modules in /boot/loader.conf
* foreach module: load & unload (several times?)
* foreach FS: run src/tools/regression/fsx [scriptable, script not written]
* run various benchmarks (only if you can compare it with previous runs on the same HW) [scriptable, script not written] ** MySQL ** apachebench ** disk IO ** net IO (more than one system required) ** IPC IO
* install some jails
* connect them via PPP, PPPoE, IPSec, ??? and redo the net IO tests [scriptable, script not written]
* diskless boot ** PXE ** BOOTP
* test DHCP (more than one system required)
* run the regression tests in tools/regression [people which know the tests should add a HOWTO or a rationale why to not run particular tests here]
* test "basic"(?) functionality of the firewalls (requires more than one system) [scriptable, script not written]
* netgraph tests
* suspend/resume
* Use the new RC(BETA) to build the whole ports tree.
* Upgrade from the previous -STABLE / -RELEASE.