Check out http://www.lightbuckets.com http://www.lightbuckets.com or http://www.itelescope.net http://www.itelescope.net There are a few other services as well

Check out http://www.lightbuckets.com http://www.lightbuckets.com or http://www.itelescope.net http://www.itelescope.net There are a few other services as well, but it's certainly a thing folks do.