I just emailed Alec at Chatango about some IM functions, and got a quick reply
"If someone chats to me via a chat box on my blog can chatango sms me or email my mobile phone as a notification (as I may not e online, or on a different computer).
In return can I email or SMS from my mobile phone back to chatango
"Yes, this is one of the planned features - it will send out SMS notifications of new messages.
Thanks for the feedback."