One of my favorite tools is the Down For Everyone or Just Me? tool. This tool allows you to see if a website is down for just your network or everywhere--meaning an issue with the actual website. I use this a lot, especially working with students. If they encounter a slow site or don't get something uploaded to Animoto or Prezi, we check the Down For Everyone tool. It allows us to see if it's our error or the site's error.
Bookmark this tool!