Since the question hasn't been answered yet, I might as well. I'm not very knowledgeable, so I not going to get real into it to start a debate, plus this isn't the thread for it as I hope most will realize and stay on topic.
The pope hasn't ok'd birth control and probably won't and the church is still against it. Here are at least the two main reasons that I know of.
1) Birth Control is a method of removing your faith in God according to the belief that God will never give you more than you can handle. He alone knows when you are ready and not ready to have kids. Of course there are several counters to this, such as why all the teenage and unwanted pregnancies. Some say it's also the lack in faith of God that allows these to happen, or for His own reasons. Again my knowlege on this isn't as great other others.
2)Birth Control can be abortifacient, meaning one aspect of birth control is to stop implantation and void an fertilized egg essentially destroying a new life. For the most part, birth control tries to prevent fertilization completely, but it fails at that pretty regularly, especially when not taken as it should be. When it fails, and an egg is fertilized and lost, then it is considered the same as an abortion and just as serious.
Again, I'm not posting any opinions of my own on here in general, as this is an area I will really have to consider in my own practice. I'm just answering a question from above and posting what I currently believe to be the Church's position. If you want to start a debate, I suggest going to the general board, and not continuing it here.