Sometimes, a buddy will send me a message and by the time I respond, they will have already signed off on their computer and gone mobile. Then, when I send a message, it gets sent to their mobile device. It's usually something like "haha" or "ok" and it's a waste of a text message. When the user goes mobile, Digsby should put that in the conversation window similar to the way it tells you that someone signed on or off. The real AIM program does this, so it shouldn't be too hard for Digsby to do. This would be a great feature to prevent accidental spamming of cell phones.