I would really like a service that did the following 1. People can message me in a way that no more difficult than now. 2. That message will be sent to me via

I would really like a service that did the following 1. People can message me in a way that no more difficult than now. 2. That message will be sent to me via whatever communication method is best for me at that moment. 3. This choice of communication method is transparent to the sender of the message. 4. All messages, no matter the communication methods, are accessible online in one place. 5. It should not require me (or anyone I communicate with) to sign up for any services they don't already use. Use cases: 1. I get an IM, but I'm not at my computer. I want to be notified of the IM (likely on my phone) and be able to reply to it from there. This is transparent to the original sender. 2. I get a text message, and I want to reply, but my reply will be long and I don't feel like typing it out on my phone, so I reply via some service online. The original sender gets a text in reply. 3. I have IM at work, but a friend only has access to email. We communicate back and forth, him via email and me via IM. It is transparent from both sides. Maybe I am projecting, but it sounds like this is in the ballpark of what Project Titan is going to do. I am sure there are other services that do this (hell, I could write an alpha of it in not that much time), but such is life. PS I believe that an important distinction between this and Wave is that Wave was trying to replace other communication methods, while this is trying to unify them.