List of funky chat and associated things
/(space) Party
\(space) Guild
|(space) Alliance
,(space) the chat channels (Help, General, etc. - whichever you currently in)
One of the square brackets is used for the private chat with a GM, when the GM establishes a chat channel with you (rare, but it does happen).
: (space) does an emote that others around you can see. It is used to roleplay actions that you can't actually do in game. *this is an example of what an emote looks like* or *EM Sarthus farts in your general direction* , etc. This is one of the few speech functions that can trace its ancestry back to IRC.
I think that ;(space) is whisper, but I've never used it.
CTRL-B makes the character bow in the direction it is facing, in 2D. I've not tested it in EC, or with a Gargoyle in either client. It can be used for other purposes, along with emotes (example, mooning, or a macro that casts an ebolt, bows, emotes *Mel Gibson shoots lighting at you from his arse*, then targets the foe.)
There's another one for Saluting, but I can't remember it.