List Taken from the newest client - somewhat incomplete:
Worldport
-help No help yet
--Teleports a player by location name
---Usage: [x y z] [facing]
Charmport
-help No help yet
--Teleports a player to a target, goes across servers
Port
-help No help yet
--Teleports a player to a destination
---Usage: [x y z] [facing]
Whois
-help Ask the server to do an account/real name lookup of the character name.
--Example: Whois character
--Account Name: accountName
--Account List: accountList
--Real Name: First Last{#}
--Seniority: {#}
--Message: character of realmName is playing accountType at/from ipAddress.
Showplayer
-help No help yet
--Shows and Hides the character. Client side only.
Blizzcon
-help Blizzcon special behaviour
--Changes status of character from 0 to 1.
Spawnallresearchlocs
-help No help yet
--[DND] - Spawns all research locations
Startproject
-help No help yet
--[DND] - Starts archaeology project.
Randomizesurveyhint
-help No help yet
--Reiterates survey hints.
Enableresearchsite
-help No help yet
--[Automation] - Jump starts a servers research sites (NA).
Clearweeklycurrencyearned
-help No help yet
--Clears the weekly currency earned by a character. The only valid currency IDs are 1 and 2.
Guildrosterview
-help The currenct Guild Roster display menu.
Guildnewsfilter
-help Stores the guild news filter.
Streamstatusmessage
-help Whether to display status messages while streaming content
--Shows the circluar loading message when streaming content.
BGLoadThrottle
-help Set the maximum percentage of available bandwidth for background streaming (0-100)
--Default 33%.
Emphasizemyspelleffects
-help Whether other player's spell impacts are toned down or not.
Servicetypefilter
-help Which trainer services to show
Digsites
-help If enabled, the archaeological dig site system will be used.
Setcurrency
-help No help yet
--Invalid Currency ID
AllMPQlocal
-help Whether all the MPQs are downloaded to the local hard disk already
Simd
-help Enable SIMD features (e.g. SSE)
--Complete gibberish. Probably means its a video card thing.
Sunshafts
-help SunShafts
--Changes the sun's look.
Preloadloadingdistterrain
-help preloadloadingdistterrain Terrain preload distance when loading
--Default 1024
preloadingdistobject
-help preloadloadingdistobject Object preload distance when loading
--Default 512
Forceenglishnames
-help No help yet
--Has no effect as of yet.
Bloattest
-help makes nameplates larger 1.0 + x
--Used for threat identification.
Useanimkits
-help
--Useanimkits help is completely blank.
Blocktrades
-help blocktrades Whether to automatically block trade requests
--Blocks trade requests from non-beastmaster and non-invis-god targets.
Hope this helps someone =D.