I had a look on Google and the boards here on EH-Net to see which secure IM program most people use. Couldn't find the answer, so I'm curious.. what do you use? I know there are some which use a Jabber server with Pidgin client, some use OpenFire and others use an OTR plugin with their usual IM client such as MSN or Kopete.
For work related IM, we're using google's talk, with pidgin and the encryption plug-in. It's only partly set up in the company though. Not everyone is using it. With our facility move (moving from one large location to 3 smaller ones) my department won't have the time to push for everyone to start using it.
OTR is great, but it can be a little shaky at times. If you're talking to someone on a different version of the plugin than you have, it will occasionally freak out and spew endless text while it tries to figure out what's going on. It seems like they need to work a little more on making sure that it doesn't get into that state. Otherwise, I like it.
I use pidgin, with the encryption plugin, regardless of which backend IM service I'm connecting to. Works with my company chat nicely, as well, and because of the encryption plugin, can keep confidential into out of prying eyes, in the server rooms...
~ hayabusa ~
"All men can see these tactics whereby I conquer, but what none can see is the strategy out of which victory is evolved." - Sun Tzu, 'The Art of War'