  We summarise the current status of our project to identify and study z~6-10
galaxies thanks to strong gravitational lensing. Building on the detailed work
from Richard et al. (2006), we present results from new follow-up observations
(imaging) undertaken with ACS/HST and the Spitzer Space Telescope and compare
our results with findings from the Hubble Ultra-Deep Field (UDF). These new
observations are in agreement with the high-z nature for the vast majority of
the candidates presented in Richard et al. (2006). We also discuss the
properties of other optical dropout sources found in our searches and related
objects (EROs, sub-mm galaxies,...) from other surveys.
