Help finding a website

I read an article about this website a week or two ago, should have bookmarked it, and can't remember what the name of it was! Basically, the website would help you gather important troubleshooting data from people. For example, if someone was having trouble with your website, you could direct them to this website and it would gather information on their OS, browser, screen resolution, etc and make it easy to send back to you.

I really could use this now and for the life of me am trying to remember the name of it! Anyone have any ideas?