Notice:

• NO macro can check for BUFFS, DEBUFFS, COOLDOWNS, or HEALTH/MANA/RAGE
• Any failed cast attempt stops the macro from casting any further spells.
• Any spell cast without "(Rank X)" will automatically cast the highest rank of the spell you know.
• All beneficial spells will automatically reduce rank if necessary to that of a lower level target.
• Each shapeshift corresponds to a "stance." Either Moonkin or Tree of Life is stance 5, depending on spec. Flight Form would be the next number.
• /castsequence resets after all listed spells are cast; reset=X will reset X seconds after last activation (not initial activation).
• The Shift modifier is currently broken, I think. It should be fixed in the next patch. There might be a workaround.
• Focus allows you to "store" a target (with /focus) until you clear the focus (with /clearfocus), which can be targetted at any time (with /target focus, or [target=focus]).

Targetting:

• /targetenemy
• /targetfriend
• /targetparty
• /targetraid
• /targetlasttarget
• /targetlastenemy
• /assist [name] - Assist your target or the named unit if specified

Using Items:

• /use <itemname>
• /use <slot>
• /use <bagid> <bagslot>
• /equip <itemname>
• /equipslot <slot> <itemname>
• /userandom <item1>, <item2>, <item3>, etc.

Pets:

• /petattack
• /petstay
• /petpassive
• /petdefensive
• /petaggressive
• /petautocaston <spell>
• /petautocastoff <spell>

Casting:

• /stopcasting
• /cast [option] <Spell Name>
• /castrandom <Spell Name>, <Spell Name2>, etc.
• /castsequence [reset=N/target/combat/shift/alt/ctrl] <Spell Name1>, <Spell Name2>, etc.

Sequenced Casting:

• A new command /castsequence reset=N/target/combat/shift/alt/ctrl spell1, spell2, spell3
• The reset line can specify a number of seconds after which a sequence resets, or if it should reset on target change or leaving combat.
• The sequence tracks the 'next' spell in the sequence until it resets, the next spell only advances on a successful cast.
• You can specify a conditional at the start of the command before the reset to filter whether the sequence is used (You cannot use per-spell conditionals).
• You can specify items as well as spells.

Action Bars:

• /changeactionbar <num>
• /swapactionbar <num1> <num2>

Attacking:

• /startattack [unit]
• /stopattack

Buffs/Auras:

• /cancelaura <name>

Macros:

• /stopmacro [option]

Options:
If multiple options are provided for an action, they must all be met before the action will happen. The options supported are as follows:

• target=unit - Run the command and perform tests on the specified unit (only applicable to spell casting or item use). You can specify 'none' as a target unit to act as if you have no target.
• help/harm - Choose depending on whether target is assistable or attackable.
• combat - Choose depending on whether you're in combat or not.
• stance or stance:# - Choose depending on your stance/shapeshift ("stance" alone matches any stance).
• stealth - Choose depending on whether you are stealthed.
• mounted - Choose depending on whether you are mounted.
• swimming - Choose depending on whether you are swimming.
• flying - Choose depending on whether you are flying.
• indoors - Choose depending on whether you are indoors.
• outdoors - Choose depending on whether you are outdoors.
• modifier or modifier:shift|ctrl|alt - Choose depending on any modifier keys you're holding at the time the macro runs.
• equipped:<invslot>|<itemclass>|<itemsubclass> - Choose if you have the specific item type equipped.
• actionbar:<bar> - Choose if a specific actionbar is shown.
• button:Z - Choose if the specified button is held down.
• pet:<name>|<family> - Choose if your current active pet has the specified name or family (e.g. pet:bear/wolf).
• channeling or channeling:spell - Choose if you are channeling (possibly a specific spell).
• exists - Choose if the target exists.
• dead - Choose if the target is dead.

For stance and modifier you can list multiple matching values separated by the / character for the option to be true if ANY of them are true. For example modifier:shift/ctrl matches if shift or control is held down.
Any option can be prefixed with 'no' to select if it does NOT match. For example [nocombat].