One of the new great featues in 2010 that I love is the ability to isolate corridor sections. Now you can simply right click on the corridor section you would like to edit and select isolate region. This will turn all the other corridors sections off for you. Once you are finish editing, just click on your corridor section again and select show all regions. See image below for an example.
Another great feature is the new boundary feature. In prior verions you would go into the corridor properties, select the boundary tab and select add interactively and you would basically trace around your corridor. Well you there is a new feature that you can select called corridor extents as outer boundary. The boundary is created from the outer most corridor feature lines. This feature will definitely save you some time.