This market matching stuff is very interesting, given the popularity and rapid diffusion of mobile phones in developing countries I think a market designed to harness the utility of mobile phones potentially offers significant benefits to the livelihoods of small-scale entrepreneurs and the informal market sector in DC.
I have a few questions/practical considerations that are not in the text on this page that I am sure you have answers to:

. Language, what will be the language of the text messages?
. Disputes, will there be a mechanism for dealing with abuses of the mobile market place?
. Location, is there the potential for a GPRS facility?
. Linked with the previous point, what type of technology is needed by the user? Does it require buy in from the users standpoint? If so this could prove as a considerable barrier
. I don’t know much about the Gale-Shapley algorithm, which seems like a useful approach, is it possible that there could be more than one good match? And how will this be resolved?

Anyway, these are just some quick points. I think this initiative has great promise and I look forward to working with you.

Dr Karanasios