The work environment we are in usually would not allow us to use something like ICQ or chat program, but fear not.....
Ｃoral Studio recently had developed this ICQ program QQ2006, which is gaining popularity among the Chinese web. I have not tested it yet, so I can't tell you how good it is.
If you have by chance come to know this software, please drop a message here or zap me.
Plus: The good point about this software is you can see the chatter IP, so they cannot hide in the dark.