Windows 7 is new, so information and guidance is still coming in, but Black Viper usually seems to be 'on the ball'. But make sure you research this properly before making any decisions what services and processes to halt.
Many Win 7 Processes will be started by Services, so I reckon that's a good place to start.
Just a point though, Win 7 was never designed specifically to reduce Processes. In fact that was highly unlikely because, as new features, new security measures, new graphic effects, and so on, are added, processes and services are bound to increase.