i can understand both sides of the fence, but i'm not naive. i have always felt that once you post something publicly on the web, you lose the control of where it goes and who is doing what with it. i feel that once i post something on the web, it's really not mine anymore. if i don't want to share, then i don't post.
i can understand how some artists would take pinterest pinning as a copyright infringement, but to me, quilting is a visual art and we share that passion by posting pictures of what we do in our blogs. we are inspired by others' fabric combinations, we learn about new patterns, techniques, and books, and heck, we just like to look at pictures of pretty quilts. there is apparently a way to add a code in the html code of a page to disable the ability to pin, so if you want- you can do that. you can add a watermark to uploaded images so that they can not be stolen for use in stock photo sites (i choose to take really bad pictures that are not properly staged with horrible lighting :) )...if you are really serious about protecting your art, there are ways to do that.
i personally use pinterest as a source for all the cool stuff i find out on the web. it puts it in one spot where i can find everything. i use to have to save it all to my hard drive. now it's all in one place where it can be 'policed' by the owner and shared with others. what's so wrong with that?
so that being said- you have permission to pin anything from my blog!! PIN AWAY :) i feel it's a compliment to have someone pin pictures from my blog. my flying goose tutorial has been pinned and repinned many times. i only ask that you do pin a picture properly so that the source link is my blog. there's nothing more annoying than seeing something on pinterest and wanted to find out more and it has been improperly pinned so the link source is wrong *grr*