These are a few websites I have come across which are informative and lets you know how to get involved with their campaigns on poverty.
This is a youtube video for anyone who missed Panorama's exposing documentary on Primark's crimes against the third world (it is just a snippet):
This is a brilliant website encouraging people to be clued up on third world exploitation and do something about it all:
This is a BBC initiave aimed at young people but it is still very informative (and has nice graphics!):