I also love Pinterest! (isn't it addictive?)
Personally, I do pin some of my creations, but I mix it with other stuff...
For example, I'm doing baby toys & accessories, so I pin my stuff on my board called "For Baby" or "Kids Fashion"...I think you don't want to create a board with only your Etsy listings...would feel like spam to me...just pin some of your items here and there on boards were you think they fit!
Here's mine if you'd like to take a look!
http://pinterest.com/vanessg86/