The following AutoCAD 2011-based products are compatible with AutoCAD Raster Design 2011:
AutoCAD
AutoCAD Architecture
AutoCAD Civil 3D
AutoCAD Electrical
AutoCAD Map 3D
AutoCAD Mechanical
AutoCAD MEP
AutoCAD P&ID
Autodesk Topobase
Please note that AutoCAD LT's exclusion from this list is intentional. Raster Design 2011 does not work with AutoCAD LT 2011.
More information, and a free 30-day trial of Raster Design 2011 can be found at http://www.autodesk.com/rasterdesign