I don't follow this well enough to be able to suggest more than Google search terms, but I have this recollection that they're also interested in applying these sorts of in vivo chemical techniques for mass spectrometric studies using isotope tags. Of course, the real advantage to "click chemistry" for non-chemists is that you can buy the materials from your favorite vendor without having to bug the nearest synthetic organic chemist. Heh.
There's also a fair bit of interest in this methodology in the polymer & materials science communities in my observations, especially as it relates to being able to functionalize polymers and modify surfaces. So while "real world," definitely not in vivo. Unless they plan on dosing something with the surface-modified nanoparticle for some reason, naturally.