Proteus is the result of over three years development with a consistent focus on product integration. It includes:

• A new application framework lets you view modules of Proteus as tabs in a single window or, via drag and drop, as separate windows for a side-by-side view
• A new common parts database enables sharing of information between schematic and PCB so that changes to data are instantly reflected across the software.
• A new live netlist means changes to connectivity in the schematic can be instantly reflected in the PCB, the Bill of Materials and the Design Explorer.
• The new integrated VSMStudio IDE binds your firmware project to your schematic design and Active Popups bring the schematic into your VSMStudio debug session.

For details: http://www.labcenter.com/index.cfm