You can get a nice sample of papers using VVV data using the Astrophysics Database System [0]. I mostly study other galaxies, which usually aren't variable on human lifespan-like timescales. Stars can vary on these shorter timescales, and VVV has compiled a huge list of those objects.
At a quick glance, I'd say some interesting results include:
* New star clusters discovered in our Galaxy [1]
* Galactic maps of dust reddening and stellar metallicity (enriched elemental abundances in stellar photospheres) [2]
* Galactic maps of stellar ages throughout the disk plane [3]
* Cataloguing other galaxies behind the plane of our own Galaxy [4]