The BIND

Binds can be created in order to say something or do something very quickly.

For example to say "Hello".

You must associate a key with your bind and each time you'll press this key, the action will be executed.

MODEL:

Type in the chat: /bind key "chat message"

EXAMPLE:

/bind p "chat HELLO"

Each time i will press p will say HELLO in the chat.

PS: Change chat by chatteam and only your team will see what you say.

You can change your name quickly with a bind too, use this :

MODEL:

/bind key "chat /name newname"

Other nice commands you can add

#name# - your name
#player_health# - health
#player_healthpercent# - health in %
#player_level# - level
#player_percentNextLevel# - how much xp to go till next level in %
#player_money# - money
#player_mana# - mana...
#player_task# - what you have todo.. (move to, attack, build, repair)
#player_kills# - kills
#player_killstreak# - kills in row
#player_deaths# - times you died
#player_secondstorespawn# - "Respawn in "
#player_team# - which team you are in (0,1,2,3)
#player_currentunit# - which unit you've got...
#player_referee# - am i referee?!
#team_idleworkers# - How many idle works your commander has.
#team_numworkers# - How many workers your commander has.
#team_maxworkers# - How many workers your commander can have.
#team_commandername# - Name of your commander
#team_commandcenter_health# - health of your sh/lair
#team_commandcenter_maxhealth# - maximum health of your sh/lair
#team_commandcenter_healthpercent# - health of your sh/lair in %
#game_serverstatus# - when spectating somebody this will be "Spectating XXXXX" XXXXX will be who you're spectating
#resource_entropy# - how much entropy(for gates) your commander has.
#resource_strata# - how much stata(for heals) your commander has.
#resource_fire# - how much fire(for fire shield) your commander has.
#resource_magnetic# - how much magnetic(for shield) your commander has.
#resource_electric# - how much electric(for electrify) your commander has.
#resource_chemical# - how much chemical(for adrenaline) your commander has.
#chat_officerColor# - color code of voice chat of officers
#chat_commanderColor# - color code of voice chat of officers
#vote_description# - Text in vote
#vote_yes# - how many voted yes
#vote_no# - how many voted no
#vote_secondes# - how many seconde there are left before vote ends
#vote_passpercent# - did enough ppl vote to make the vote pass? in %

Source : http://www.newerth.com/smf/index.php/topic,519.0.html

If you are insane there are some binds that are harder to make, look at the newerth site