I’ve just finished building a brand new website called ScreenDrink.com. The purpose of this site is to provide image screen captures of websites. The key differentiator for this new site is I’m providing https as well as http access to the images.
This means you can keep your sites secure without serving insecure content from services you utilize.

I am currently self-hosting the site but if there is enough interest and usage, I’ll move the site into the cloud for more space and reliability.

Visit http://www.screendrink.com to learn how to use the free service on your own website!