So what's the benefit over just sending an email? If I do not need to respond immediately, why do I need an immediate notification (sound + popup/flashing window) that you've sent me an IM? Let it go to my email and I'll think about it after reading the email.

>Not having to immediately stop everything im doing allows me to stay in flow state.

So is it OK in remote work for me to turn off IM for 2-4 hours to remain in flow state? If not, then there will be no flow state for me.