An interesting discovery by Kara at the Colors...Pretty blog. Apparently, she alleges, Flickr sharpens and improves images when you upload them to their service. Nice for amateurs, but possibly annoying for professionals. What if you intended a photo to look blurry in parts or altogether? Some Photoshop mavens might also prefer to do their own sharpening as well. Does Flickr use an unsharp, a sharpen, a smart blur, contrast enhancement? As Kara points out, this should probably be up to the user.