Last night I went and saw Vinton Cerf lecture. If you dont know who this is, he was the co-founder of TCP/IP.
He talked about how he is helping build an inter-planetary network, and they are designing a new protocol for this. Due to the extremely high latency between planets (it could be several hours) they need a new, more robust protocol.
He said they are working on getting Mars networked, then from there Venus, etc.