This is an announcement for the paper "Operator algebras with unique preduals" by Kenneth R. Davidson and Alex Wright. Abstract: We show that every free semigroup algebras has a (strongly) unique Banach space predual. We also provide a new simpler proof that a weak*-closed unital operator operator algebra containing a weak* dense subalgebra of compact operators has a unique Banach space predual. Archive classification: math.OA math.FA Mathematics Subject Classification: 47L50; 46B04; 47L35 Remarks: 13 pages The source file(s), DavidsonWright3a.tex: 44578 bytes, is(are) stored in gzipped form as 0812.3159.gz with size 14kb. The corresponding postcript file has gzipped size 96kb. Submitted from: krdavids@uwaterloo.ca The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0812.3159 or http://arXiv.org/abs/0812.3159 or by email in unzipped form by transmitting an empty message with subject line uget 0812.3159 or in gzipped form by using subject line get 0812.3159 to: math@arXiv.org.