I do agree with Paul’s (somewhat hidden) observation that tapping into an existing infrastructure (in the case of Haiti: the Open Street Map community) is a next step. I’d generalise that: tap into an existing social infrastructure. Consider the Haitian diaspora as such.
One way to look at crowdsourcing is as "a random group of people connected by technology figuring out processes to address a one-off goal". But that’s still a rather centralised view: an unconnected mass of people coming together like a flash mob.
A better way would be to consider socio-technical architectures: groups of people connected by technology, establishing (new) patterns of collaboration for on-going goals. That’s more a peer-to-peer view: an ad-hoc configuration of groups of people with different skills coming together to address a complex situation.