Sitemeter is a useful service for tracking visits to my blog. I typically check Sitemeter's page for Why Homeschool a couple times a day.
Recently Sitemeter was down for a day or two. I did a Google search to see if there were any details about why it was down or when it would be back up. I came across Is It Down Right Now? It tracks various web sites and reports on if htey are down and if so how long the site has been down.