Print to chat area...
 

How?
Its not eng->ClientPrintf(), because that prints to the console.
its not helpers->CreateMessage(), thats the upper left corner

I saw this somewhere, it was posted on hlcoders...

yea but it required the use of c_baseplayer to do..... which isn't possible via a server plugin

I have the same problem. There's engine->Con_NPrintf and engine->Con_NXPrintf which appear on the HUD and can change y position and color, but its completely useless as I can tell because it only seems to print on a listen server's host :(

Use SayText usermessage for this, it will show chat messages on screen.

do you have an example? I don't know how to send a "SayText" message, also is there a list of these messages somewhere?

Yeah some kind of example would be great!

Any idea how to trap the say and say_team messages from the client?

I tried a usermessage
bf_write *pWrite;
pWrite = engine->UserMessageBegin((IRecipientFilter *)&mrf,1);
but cant get it to link, It cant find a lib for the bf_write.

Don't waste your time.. I spend literally hours and got the bf_write to work and wrote a filter and at the end of it all, it crashes with a 'No UserMessage Given' error.

You have to include bitbuf.cpp into your makefile to get it working. And yes, usermessages are working fine.