A Fellow BO-aphobe (or TMI)

I just had to link to this post from the blog These Little Moments. This is a girl after my own heart. Not only does she have the word "shoes" in her blog description, but she also has a fear of having BO. I have struggled with this fear since elementary school. I have spent many years trying out every deodorant I could get my hands on because I was afraid I had become immune to my old one. I just spent every day of my trip home looking for my favorite deodorant and could only find the roll-on kind-- and no, it's not the same! What do I rely on day (and night)?