Zen is wonderful. In my opinion, a mindfulness or meditation program shouldn't just have a profound impact on your life - it should make your life start to have a profound impact on you!

I highly recommend the following books, which really help you chew through the layers of expectations, belief and doubt when it comes to Buddhism (and in particular, Zen):

http://www.amazon.com/Ending-Pursuit-Happiness-Zen-Guide/dp/...

http://www.amazon.com/Buddhism-without-Beliefs-Stephen-Batch...