This is an announcement for the paper "Lecture notes on duality and interpolation spaces" by Michael Cwikel. Abstract: Known or essentially known results about duals of interpolation spaces are presented, taking a point of view sometimes slightly different from the usual one. Particular emphasis is placed on Alberto Calderon's theorem describing the duals of his complex interpolation spaces [A_0,A_1]_\theta. The pace is slow, since these notes are intended for graduate students who have just begun to study interpolation spaces. Archive classification: math.FA Mathematics Subject Classification: 46B70 (primary) 46B10 (secondary) Remarks: 24 pages The source file(s), NotesOnDuality-arXiv.tex: 93949 bytes, is(are) stored in gzipped form as 0803.3558.gz with size 25kb. The corresponding postcript file has gzipped size 138kb. Submitted from: mcwikel@math.technion.ac.il The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0803.3558 or http://arXiv.org/abs/0803.3558 or by email in unzipped form by transmitting an empty message with subject line uget 0803.3558 or in gzipped form by using subject line get 0803.3558 to: math@arXiv.org.