I'm glad some attention is finally being brought to this. I edited my profile a couple of days ago, and hit the new interests-to-fan page conversion. It did not do a great job at all; I ended up a fan of some really off-the-wall, incorrect things (because the same word or title can have multiple meanings or belong to multiple organizations). My immediate concern was that there is still no way to make membership to a fan page private. So I immediately checked the privacy settings, and while I had been opted in (without consent) to display my likes and interests, there is a privacy option to make them private. The *HUGE* catch in the fine print is that people can still check to see if you are the member of any fan page simply by looking through the group's members, where you'll be visible.
Unless I am mistaken, only reliable option for people with legitimate concerns about human rights violations, nosy employers, angry exes, or nosy family members is now to enter absolutely no interests, things to do, music, movie, or books on Facebook, as all of this data is now at least partially public, regardless of how security settings are configured. I just read an article that discussed identifying intimate details, such as a person's sexuality, using only this publicly available data and statistical data. While things like that are generally protected in the US, consider Facebook members abroad - people who practice a religion or philosophy in countries where there is religious persecution could be at tremendous risk now, and not even know it. All their government would have to do is start scanning certain fan pages.
Obviously, Facebook's income does not come from members, it comes from advertisers, who are its real customers. However, for the last couple years, they have made Buzz-worthy privacy moves that its millions of members really need to stand up to, before somebody gets hurt.