David Johnson over at djx blog has recompiled spReticle for maya 2011. spReticle is an open source offering from Sony Pictures Imageworks that gives you the ability to add customizable viewport overlays like gate masks and safe guides and much more. You can download spReticle here.
open source Reticle pluging for Maya from jc cornwell on Vimeo.
Put the plugin (mll file) in your plugins folder and the mel files in your scripts folder. Use the plugin manager to load the plugin, then to create a reticle node use the following command:
spReticleLoc;
This will set up a reticle with a 16:9 transparent gate mask with 4:3 center-cut action/title safe lines, frame numbers in the top left corner, scene name top center. You can modify all these to you liking and add many variations using the attribute editor.