What is the purpose of the Dragon Priest Masks?

I've found some nice masks and held on to them. But is there any special purpose to the Dragon Priest Masks other than their magical powers?

The masks I'm talking about are:

• Hevnoraak
• Konahrik
• Krosis
• Morokei
• Nahkriin
• Otar
• Rahgot
• Vokun
• Volsung

Solution 1:

After collecting the 8 Dragon Priest Masks, and the Wooden Mask, followed by placing the other 8 Dragon Priest Masks on the correct pedestals, you'll be granted a 9th mask, Konahrik.

You can find the Wooden Mask after entering a mounded room, located just outside Labyrinthian, known to some as the Bromjunaar Sanctuary. In the room, you will find the Wooden Mask near some skeletal remains. It's latent power will only work in that room. Put it on and see what it reveals...