So, OmnomIRC has so many features - most people don't even know them all, or how to use them, resulting in very basic questions.
Thus I am making this topic, in the hope people will realize all its features and use 'em!

So, first of all only chatting is pretty self-explanatory i guess
Now, there are also multiple channels up there, the tabs, hitting them will join you that channel.
Under the channels is the topic container, it'll display the topic of that channel, if it has any.

Now, text sometimes appears red, that means that you got highlighted, you achive that if the message contains (by default the first 4) chars of your nick.

There is a options menu, in the top-right corner there are 5 hotlinks, one of them is 'Options', hit it and you will have more ways to customize your OmnomIRC.

Commands

/me <message>	Send an 'action' message to the channel
/msg <nick> <message>	Sends a private message to the user with the nick, only works with nicks without spaces. For ones with use /query
/query <nick>	Opens a new channel with a private chat with the corresponding nick
/join <chan>	Joins new channels. Yes, you can also create new channels, just keep in mind that new ones can't start with a #, so you'd type. let's say '/join the game'
/ignore <nick>	Ignores all incoming messages by <nick>
/unignore <nick>	Unignores that nick, if you set <nick> to * it'll unignore all ignored nicks
/ignorelist	Returns the list of all nicks you are ignoring
/window <number>	Switches to the nth tab
/help	Displays help message

More features

• Hitting tab on a started word will auto-complete the nick
• Hovering over a user in the userlist displays the last time seen
• Smileys, hitting the smiley next to the input box will open a list of all available smileys, hit 'em and the appear in the input box
• Textmode support - chat without the use of javascript, to do so go on omnomirc over a text-based browser or go to http://omnomirc.www.omnimaga.org?textmode
• Chat with a calculator - yes, you heard me right, with a calculator. For more info on that visit http://gcn.omnimaga.org

Operator stuff
There are also ops on OmnomIRC, a user in the following group is a global op by default:
"Support Staff","President","Administrator","Coder Of Tomorrow","Anti-Riot Squad"

Here are the admin commands:

/op <nick>	Op's another user - that will only be in the current channel
/deop <nick>	de-ops a user in the current channel
/topic <topic>	Sets the current topic
/ban <nick>	Banns a user from the current channel
/unban <nick>	Unbans a user from the current channel

i have the feeling that i missed some, lol

An help command in omnomIRC listing all those features would be nice.

ok, i made this list now more complete, poke me if i forgot anything

Smileys, hitting the smiley next to the input box will open a list of all available smileys, hit 'em and the appear in the input box

My screen broke

Anyway, nice to see a help option finally appear. I didn't know you could join other channels in omnom, that's nice.

Bug report: /unignore no longer works. I don't think /ignore works either, but I am bit scared of trying right now. If I type /unignore nickname, nothing happens and the user remains ignored.

It might be good, since I wanted to do that

hey, could you list the commands for bots as well?
like @calc [insert command here]

The bots are not part of OmnomIRC.
You'd have to ask the bot owners to make their own topic listing the commands. Of which I think there are already a couple.

EDIT: http://ourl.ca/19243