  We discuss recent developments and challenges of beam dynamics in Dielectric
Laser Acceleration (DLA), for both high and low energy electron beams. Starting
from ultra-low emittance nanotip sources the paper follows the beam path of a
tentative DLA light source concept. Acceleration in conjuction with focusing is
discussed in the framework of Alternating Phase Focusing (APF) and spatial
harmonic ponderomotive focusing. The paper concludes with an outlook to the
beam dynamics in laser driven nanophotonic undulators, based on tilted DLA
grating structures.
