Just put up a new post on Sembuse, which is Mbugua's (of Symbiotic.co.ke) newest venture.  I think this has a lot of potential, especially if the right demographic (ie, youth) pick it up and it gets traction.  

Here's my post on it: http://whiteafrican.com/2009/04/26/sembuse-east-africas-first-mobile-social-network/

Point your WAP browser to http://m.sembuse.com to give it a try.

Cheers,

Erik Hersman