Yesterday we had access problems from some of our customers because of a cable cut to one of the carriers that supplies my main ISP, as we weren't notified. :-(
I am looking for suggested services that can monitor my network from various parts of the United States to let me know if our web site is having availability issues. I would be happy with some combination of ping and loads of our web site. I know that back in the day there were several companies charging a lot of $$ to monitor how fast your site was loading and even to do synthetic transactions. I am more interested in knowing how the network is than my web server specifically. Ability to access through wireless carriers is a plus since we have employees that need to be able to access our data center from their phones and tablets. We block IPs outside of the US, so I don't care...