There have been a number of threads around adding international roaming (a great idea). Coming from Telus, it's the one piece I miss now that I'm with PM. I travel outside of Canada/US about once a year and it's nice to have the peace of mind that I can be reached in an emergency. I don't typically use talk or data when travelling internationally, just want to be reachable.
As a stop-gap, could PM offer inbound text messages while roaming internationally? This would at least allow people to communicate with us while travelling outside of Canada/US (eg. "Your house is on fire, the dog is vomiting") in emergency situations. Outbound we would still need to revert to using VoIP, Wi-Fi or some other mechanism until a full international roaming solution is available.
From a competitive perspective, Chatr offers international roaming on prepaid solutions (pay per use) as does Wind - would gladly spend a few dollars (pay per use) for the peace of mind.