This is an announcement for the paper "Operators on C_{0}(L,X) whose range does not contain c_{0}" by Jarno Talponen. Abstract: This paper contains the following results: a) Suppose that X is a non-trivial Banach space and L is a non-empty locally compact Hausdorff space without any isolated points. Then each linear operator T: C_{0}(L,X)\to C_{0}(L,X), whose range does not contain C_{00} isomorphically, satisfies the Daugavet equality ||I+T||=1+||T||. b) Let \Gamma be a non-empty set and X, Y be Banach spaces such that X is reflexive and Y does not contain c_{0} isomorphically. Then any continuous linear operator T: c_{0}(\Gamma,X)\to Y is weakly compact. Archive classification: math.FA Mathematics Subject Classification: 46B20; 46B28 The source file(s), dgvt_talponen.tex: 17582 bytes, is(are) stored in gzipped form as 0801.2314.gz with size 6kb. The corresponding postcript file has gzipped size 61kb. Submitted from: talponen@cc.helsinki.fi The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0801.2314 or http://arXiv.org/abs/0801.2314 or by email in unzipped form by transmitting an empty message with subject line uget 0801.2314 or in gzipped form by using subject line get 0801.2314 to: math@arXiv.org.