Large scale imaging surveys such as Euclid will drastically 
change the number of known gravitational lenses.  This 
will transform the field of strong lensing in several ways.  
There is first the problem of finding the lenses in massive 
data sets and then the question of what we can learn from them 
about galaxy structure, dark matter and cosmology.  I will review 
particularly interesting cases and what we might expect to learn in 
the future.