As my thesis advisor wrote in a great book on death ritual in Oaxaca Mexico:
This word does not mean, as it is so often does in everyday English parlance, 'prevalent,' 'accepted,' 'standard,' 'in vogue,' or 'current'; 'popular,' in the context of Latin American studies, has more specific, technical, and pervasively political meaning, and can refer to any group of people that falls outside dominant culture or the inner circle of powerful or wealthy elites (K. Norget, Days of Death, Days of Life).
Personally I became interested in what gets called "popular education" after sojourning in West Africa. The pedagogue most associated with this movement is Paulo Freire.
His ideas were a radical blend put into the furnace from working with adults in North-East Brazil. These adults were landless & illiterate, but achieved functional results in reading and writing within 40 days.
Ultimately my interest in these topics led to research, reflection and drop-in-bucket actions. More importantly it stressed keeping my ego, priviliges in check, while stressing the aims, ideas and decision-making powers of learners.
Here's a post-Powerpoint presentation on main tenets of Freirean pedagogy. Scroll around, zoom in & out like google-earth; edit, copy & adapt like MP3s.