General Relativity is inconsistent with quantum theory which
leaves our understanding of nature incomplete and unsatisfactory. The now 80 years old quest for a consistent theory of quantum gravity has so far almost entirely focused on mathematical consistency. But as of recently the possibility to look for observational evidence has received an increased amount of attention, as a tool to provide guidance for the construction of of the theory.
Here, I summarize recent developments in the search for
experimental signatures for quantum gravitational effects and how these help to put constraints on the theory-construction. Some of the topics that I will cover are the prospects of finding Planck scale effects in gamma ray bursts, in neutral Kaon oscillations, or with massive quantum oscillators. If time allows, I will also comment on the search for holographic noise and how to find evidence for space-time discreteness.