This is an announcement for the paper "On Banach spaces containing $l_p$ or $c_0$" by George Androulakis, Nigel Kalton, and Adi Tcaciuc. Abstract: We use the Gowers block Ramsey theorem to characterize Banach spaces containing isomorphs of $\ell_p$ (for some $1 \leq p < \infty$) or $c_0$. Archive classification: math.FA Mathematics Subject Classification: 46B20; 46B40; 46B03 The source file(s), ellpAndKalTca.tex: 22204 bytes, is(are) stored in gzipped form as 0810.0325.gz with size 7kb. The corresponding postcript file has gzipped size 72kb. Submitted from: giorgis@math.sc.edu The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0810.0325 or http://arXiv.org/abs/0810.0325 or by email in unzipped form by transmitting an empty message with subject line uget 0810.0325 or in gzipped form by using subject line get 0810.0325 to: math@arXiv.org.