[regression]

I have tried to find the same thing but no luck. At one point I found some text files buried in a directory, but they were very hard to read. The only program I have found that saves history is OctroTalk. You have to have a gmail account to use it and all your conversations (gtalk / yahoo / aim, etc) are saved in gmail's chat history. But, the program is not free. I used it while it was in beta (are free), but not anymore, but I am sure it still works the same.