Just like Microsoft has a program called Designed for Windows XP Logo, Forum Nokia has announced the launch of Designed for S60 Devices logo program.

From the site:

The “Designed for S60 Devices” logo program has been set up to help software developers let you and other customers know that their particular software is designed for S60 devices. This helps you as a S60 device owner and consumer when looking for new software for your S60 device.

Designed for S60 Devices logo program via [Nokia Forums]