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Half-metallic materials, which exhibit complete spin-polarisation at the Fermi level, hold great promise for device applications in the field of spintronics. Amongst a variety of drawbacks, however, one of the most pressing is a lack of knowledge concerning surface and interface properties. In particular, the relationship between the stability of different surface/interface phases and the presence of surface/interface localised electronic states is of great importance. In this talk, I will describe density functional calculations aimed at elucidating this relationship for various surfaces of the half-metallic semi-Heusler alloy NiMnSb and the half-metallic zincblende phase of MnSb.