According to the New York Times, organizing data by tagging it is now "all the rage among the digerati":
Here's how we tend to organize our digital photos: We stick them into a folder on our computer and label it ''Hawaii trip,'' or whatever. Here's a new way: Forget folders or albums. Just ''tag'' the photos based on what's actually in each frame. Now, extrapolate this concept to the ideas, images, videos -- and people -- you meet or wish to find online. If they're properly tagged, they're far easier to find ...
Tagging has the potential to change how we keep track of and discover things digital -- even whom we meet online. Several startups are banking their futures on it.
Complete article (registration required).