I have heard already of this android bug from the Google nexus one forum but now it happened to me too. I had maybe 6 sms threads in the stock android sms application. I sent a question via sms to one person and it appears in the right thread. I get an sms back from another person answering the question. The second person who answered is one of the 6 threads actually in my sms application. This is really a serious problem....