Nothing exploit-worthy here but thought people might be curious. There are two missing from the list, /ZH and /ZHDEV ..for the zone hopper addon. It loads the interface but doesn't actually work.
Many of the commands are temporary or are related to debugging and probably wont be in future versions.
They all seem to be case sensitive, as are playernames for many (if not all?) commands.
edit:
the c* commands are for your circle
I believe the g* are for your guild (not sure on the difference between circle/guild though)
p* are for party
wp* for warparty (raid group)