FLD quickly comes to mind as a very effective way to use ICT tools to document innovation processes and generate knowledge especially agricultural local content, it involves the farmner themselves leading the process hence they choose the ICT of choice and that which they are comfortable to use.

Here is a document from PROLINNOVA with more details... 

There is great potential in mobile phones as a means of relaying information or creating two way channel for information access. Considering the penetration rate of mobile phones especially most African countries, it becomes the most desired way to recieve and share information. A number of great areas have been discussed here already, here is my contribution:

Frontline SMS as a good number of you may already know is a great tool for SMS communication management and is freely available for download to service providers.

Twitter on feature phones is something Im thinking about recently and I see it as a very low cost means of sharing information within communities and groups of farmers and other groups. Twitter has SMS short codes for a number of countries which one can use to configure feature phones to recieve tweets as SMS.  If a telecentre/service provider/opinion leader are followed by special interest groups of community members such as famers, they can then tweet content which is then broadcasted to all the group members. Whats interesting is that only one person sending the tweet is charged and thats if he/she does it from their phones. In Kenya this would cost about USD 0.0125.

The limitation for SMS is ofcos the shortened information which may loose meaning, however for successful cases I have witnessed usually have content validators who are proffesionals in given fields such as Agriculture and can figure out if the SMS content developed makes sence or not.

Cheers!