What's going on over there can't really be properly called rape. The term applies, but it isn't a strong enough word, and that's really saying something. What Congolese women are enduring is the intentional, systematic destruction of their bodies, their families, and their society. Think firing a bullet into her vagina. Think bayonettes. Understand that this is rape-as-a-weapon and not rape for it's usual motives.
I highly recommend clicking the link above and reading his full blog entry. Be warned though, the details of what is currently happening in the DRC are extremely graphic and disturbing. He also has a number of links to news articles from people on the ground there and the official reports submitted to various subcommittees of congress.
I'm not sure what the proper response is to this madness, only that a way to stop in needs to be found, and quickly. The one suggestion I've seen so far, that everyone can help out with, is donating to the International Medical Corps, a group that is doing everything they can to help the civilians caught in the middle of this.