My "Apartheid?" poster page has now gotten over 5000 pageviews, with links to that page coming from all over the world and many emails from people who appreciated them, or have made suggestions for more.
It received over 250 Facebook "Likes."
Other websites have reproduced the posters on their pages, adding thousands more views.
The YouTube video I threw together with some of the posters has done OK, with over 2200 views itself.
I'm still waiting for more people to send photos of how the posters have been used on college campuses. I hear that some turned them into postcard-sized handouts.
UPDATE: A Google search of "Apartheid week posters" shows many of mine towards the top. Nice!