Glyph prepares Matte Painting ToolKit, a plugin for Maya 2009/2010. The plug boasts some really nice features include blending projections based on incident angle, dilate occlusion mattes with soft edges to better blend between projections, model interactively from your projection perspective with viewport updates to your projections (similar to 3dsMax), and viewport gamma shifting for linear color pipelines. There are some great demo videos on Glyph’s site as well as a demo version.