  Resonating valence bond (RVB) theory of high Tc superconductivity, an
electron correlation based mechanism, began as an insightful response by
Anderson, to Bednorz and Muller's discovery of high Tc superconductivity in
cuprates in late 1986. Shortly a theoretical framework for quantum spin liquids
and superconductivity was developed. This theory adresses a formidable strong
coupling quantum manybody problem, in modern times. It is built on certain key
experimental facts: i) survival of a dynamical Mott localization in a metallic
state, ii) proliferation of bond singlets and iii) absence of fermi liquid
quasi particles. After summarising RVB theory I will provide an aerial view of,
mostly, new superconductors where I believe that, to a large degree RVB
mechanism is at work and indicate prospects for even higher Tc's.
