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Motivated by the recent discovery of superconductivity in two dimensionalCoO$_2$ layers, we present some possibly useful results of the RVB mean fieldtheory applied to the triangular lattice. Away from half filling, the orderparameter is found to be complex, and yields a fully gapped quasiparticlespectrum. The sign of the hopping plays a crucial role in the analysis, and wefind that superconductivity is as fragile for one sign as it is robust for theother. Na$_x$CoO$_2\cdot y$H$_2$O is argued to belong to the robust case, bycomparing the LDA Fermi surface with an effective tight binding model. The highfrequency Hall constant in this system is potentially interesting, since it ispointed out to increase linearly with temperature without saturation for T $>$T$_{degeneracy}$.Comment: Published in Physical Review B, total 1 tex + 9 eps files. Erratum  added as separate tex file on November 7, 2003, a numerical factor corrected  in the erratum on Dec 3, 200

physical review. b, condensed matter

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