Many clients already support OTR: http://en.wikipedia.org/wiki/Off-the-Record_Messaging#Native
Many clients have plugins for OTR: http://www.cypherpunks.ca/otr/
PS: Yes, I know about gimp, darkroom, inkscape, etc. While I can accomplish the task with them, they lack usability, stability, and speed.
Any sufficiently advanced bug is indistinguishable from a feature. -- Rich Kulawiec