Hi again!

I was wondering what the easiest was is to allow clients to do their own updating on certain pages of their site when they have no knowlege of web design? The reason I ask is that I have a potential client who would like to make a portal for a specific clientele, and would like each of them to be able to do their own updating on portions of the content of their site (say the minutes of a meeting) in order to cut down on the cost to them, as they are non-profits. Any low cost practical suggestions?