Worried abt “did-not-receive-your-chat” in Gtalk when ur friends are offline. If so, you will be pleased to hear that Google talk team is making things a little bit better by turning on another top requested feature in Google Talk: offline messages.
As you’d expect, this enables you to send messages to Google Talk friends who are offline. The messages will be delivered to your friends the next time they sign in with Google Talk or a third-party client. And when they sign in to Gmail, offline messages will be displayed as unread messages in their inbox. In Gmail, offline messages can be searched and organized — just like instant messages in your chat history. Your Google Talk account needs to have a Gmail inbox with chat history enabled in order to receive offline messages, so make sure to turn it on now!
Thanks : GoogleTalkblog