You could also check out trillian ( http://www.trillian.cc ); it has a similar feature. In response to what NemorY said... I am not sure you are correct in your evaluation. Although my experience in the field is limited, it is my understanding that the length of an encrypted message is not all that relavent to the strength of the cipher. I know that repetition of characters and lengths can be looked at by cryptologists and all but I'm not sure you can say that one is stronger than the other just because it has more characters.