Blizzard has updated it's emote guide, with a full list. Here's a sample:

/agree You agree. You agree with (Target).
/amaze You are amazed! You are amazed by (Target)!
/angry You raise your fist in anger. You raise your fist in anger at (Target).
/apologize You apologize to everyone. Sorry! You apologize to (Target). Sorry!
/applaud
/applause You applaud. Bravo! You applaud at (Target). Bravo!
/attacktarget You tell everyone to attack something. You tell everyone to attack (Target).
/bark You bark. Woof woof! You bark at (Target)
/bashful You are bashful. You are so bashful...too bashful to get (Target)'s attention.
/beckon You beckon everyone over to you. You beckon (Target) over.
/beg You beg everyone around you. How pathetic. You beg (Target). How pathetic.
/belch You let out a loud belch. You burp rudely in (Target)'s face.
/bite You look around for someone to bite. You bite (Target). Ouch!
/bleed Blood oozes from your wounds.
/blink You blink your eyes. You blink at (Target).
/blood Blood oozes from your wounds.
/blow You blow a kiss into the wind. You blow a kiss to (Target).

Here's the full list.