Output keystrokes via PS2 to PC

I hope this is the right location.

I'm currently planning for an arduino to output some keystrokes to a PC. Originally I was just going to use some relays and the guts of a keyboard, however I see a few projects floating around like practicalarduino.com. It looks to me like that's just for reading input from a keyboard, but does anyone know if it could be modified to send keystrokes? Or are there other projects to do this that my google-fu has not found?

It's not as simple as that see:-
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1271712343