We present a study of cursors for 3D pointing/selection interfaces. We compared a stereo- and mono-rendered (one-eyed) cursor used with two mouse-based and two remote pointing techniques. This comparison was performed in a 3D Fitts' law pointing experiment with varying target depths. Results indicate that the one-eyed cursor is beneficial only for some pointing techniques. While the mouse-based techniques performed best, our new ray-screen technique outperforms traditional ray pointing. This is likely because it is less affected by target depth.