Full Body Scanners at O'Hare

I watched a Yahoo! video this afternoon that talked about the recent installment of full body scanners in the United terminal at O'Hare airport. The purpose of these scanners- in use as of yesterday- is to look for "anomalies on the body," detecting both metallic and non-metallic items. These scanners have been under scrutiny for some time now, but I have yet to come in contact with them. Now that they are at O'Hare and will effect me directly next time I travel, this video made me think about the morals behind this growing installment. Do these scanners violate passenger privacy?

When I look at the bigger picture, it's hard for me to see anything wrong with these scanners. They are there to protect us, and when reflecting on past events like 9/11 security seems necessary. So how can I argue that that's a bad thing? But at the same time, someone sitting behind a plexiglass wall is analyzing an image of my body to make sure I'm not carrying and weapons and to a degree, this seems like an invasion of privacy. So do I give up a small amount of privacy for the sake of protection? Do the benefits outweigh the negatives?

I think the most important thing to remember when thinking about these scanners is that traveling by airplane is a choice. Although I don't see a significant problem with them, those that do can choose an alternative mode of transportation.