One of the most important issues in quantum gravity is to identify its
semi-classical regime. First the issue is to define for we mean by a
semi-classical theory of quantum gravity, then we would like to use it to
extract physical predictions. Writing an effective theory on a flat background
is a way to address this problem and I explain how the non-commutative
spacetime of deformed special relativity is the natural arena for such
considerations. On the other hand, I discuss how the definition of the
semi-classical regime can be formulated in a background independent fashion in
terms of quantum information and renormalisation of geometry.Comment: 5 pages, Proceedings of the Second International Workshop DICE2004
(Castello di Piombino, Tuscany) "From Decoherence and Emergent Classicality
to Emergent Quantum Mechanics