CELLSPACING controls the distance in pixels between each cell in the table. The first table has a cellspacing of 15 pixels; the second table isn't using cellspacing. Notice the difference here. The first table should be rendered with a wider gap between the cells.

Navigator | Messenger | Collabra
Composer | Calendar | Netcaster

This table contains no cellspacing.

Navigator | Messenger | Collabra
Composer | Calendar | Netcaster